Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Continuous Tense: Past Continuous Tense is used in the following situations:

I.    Interrupted Action: Past Continuous is used to indicate a longer action in the past, interrupted by a shorter action. The shorter action is usually in the Simple Past tense.

     Example:    I was cooking when you called.

In the question : -

1. Mercy _____________ while her mom ____________ breakfast.

In the first and second  blank part , the correct form of tense that can be placed is was studying and was cooking as it is used to indicate that two actions were happening at the same time in the past i.e. the actions were parallel.

2. I _______________  the plants when my brother came home.

In this sentence , the correct form of tense that can be placed in the blank part is was watering as it is used to show  about actions or behavior that were begun and ended at some time in the past . With singular subjects we use was and i continuous form we always use ing .

Thus , the Correct Option is C , which is Was studying , Was cooking , Was watering .

Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Continuous Tense: Past Continuous Tense is used in the following situations:

I.    Interrupted Action: Past Continuous is used to indicate a longer action in the past, interrupted by a shorter action. The shorter action is usually in the Simple Past tense.

     Example:    I was cooking when you called.

In the question : -

1. I ____________  about meeting you.

In this sentence , the correct form of tense that can be placed in the blank part is was thinking as it is used to show  about actions or behavior that were begun and ended at some time in the past . With singular subjects we use was and in continuous form we always use ing .

2. My friends _____________  for me the whole day.

In this sentence , the correct form of tense that can be placed in the blank part is were waiting as it is used to show  about actions or behavior that were begun and ended at some time in the past . With plural subjects we use were and in continuous form we always use ing .

3. Even at midnight, we ______________ on the balcony and talking.

In this sentence , the correct form of tense that can be placed in the blank part is were sitting as it is used to show  about actions or behavior that were begun and ended at some time in the past . With plural subjects we use were and in continuous form we always use ing .

Thus , the Correct Option is A , which is Was thinking , Were waiting , Were sitting .

Tense : - The tense of a verb in a sentence expresses time the event has occurred. There are three tenses of a verb: Present, Past and Future: time now, time then and time to come.

Past Continuous Tense: Past Continuous Tense is used in the following situations:

I.    Interrupted Action: Past Continuous is used to indicate a longer action in the past, interrupted by a shorter action. The shorter action is usually in the Simple Past tense.

     Example:    I was cooking when you called.

In the question : -

1. When Joe __________  cricket, he sprained his ankle.

In this sentence , the correct form of tense that can be placed in the blank part is was playing as it is used to show  about actions or behavior that were begun and ended at some time in the past . With singular subjects we use was and in continuous form we always use ing .

2. At five o’clock, I ____________  for the Maths exam.

In this sentence , the correct form of tense that can be placed in the blank part is was studying as it is used to show  about actions or behavior that were begun and ended at some time in the past . With singular subjects we use was and in continuous form we always use ing .

3. Yesterday, she ______________ for me in the evening.

In this sentence , the correct form of tense that can be placed in the blank part is was waiting as it is used to show  about actions or behavior that were begun and ended at some time in the past . With singular subjects we use was and in continuous form we always use ing .

Thus , the Correct Option is D , which is Was playing , Was studying , Was waiting .