Modals: They are verbs which are used before the main verb to express ability, possibility, obligation, permission, suggestion, request, certainty or necessity.They indicate the attitude, intention and the mood of the speaker.

• They cannot be used alone in a sentence.
• In case of Questions they are used alone.
• They are not affected by the change in person i.e. first, second or third form.
• Present Participle or Past Participle form of a verb is never used with a modal.

Use of Will:

1. The use of will in second and third person denotes pure future actions, With first person, will denotes threat, warning, promise or determination. e.g.

    (a) He will go tomorrow.

Will is also used for formal request.

    e.g. Will you close the door?

In the question : -

1. ________ your friend join us for some lunch?

In this sentence , will is the correct modal that can be placed in the blank part as it is used to show requests and offers .

2. You _______ finish your homework this instant!

In this sentence , will is the correct modal that can be placed in the blank part as it is used to show a certainty that the command will be obeyed.

Thus , the Correct Option is C , which is will , will .

Modals: They are verbs which are used before the main verb to express ability, possibility, obligation, permission, suggestion, request, certainty or necessity.They indicate the attitude, intention and the mood of the speaker.

• They cannot be used alone in a sentence.
• In case of Questions they are used alone.
• They are not affected by the change in person i.e. first, second or third form.
• Present Participle or Past Participle form of a verb is never used with a modal.

Use of Will:

1. The use of will in second and third person denotes pure future actions, With first person, will denotes threat, warning, promise or determination. e.g.

    (a) He will go tomorrow.

Will is also used for formal request.

    e.g. Will you close the door?

In the question : -

1. “I ______  have to say goodbye if I don’t go to the airport.”

In this sentence , won't is the correct modal that can be placed in the blank part as it is used to show an expected hypothetical outcome.

2. This darn washing machine _________  turn on.

In this sentence , won't is the correct modal that can be placed in the blank part as it is used to show express or inquire about a person or thing’s ability or willingness to do something.

3. This house ______ not be used as a hotel for your friends, do you understand me?

In this sentence , will is the correct modal that can be placed in the blank part as it is used to show a certainty that the command will be obeyed.

Thus , the Correct Option is B , which is won't , won't , will .

Modals: They are verbs which are used before the main verb to express ability, possibility, obligation, permission, suggestion, request, certainty or necessity.They indicate the attitude, intention and the mood of the speaker.

• They cannot be used alone in a sentence.
• In case of Questions they are used alone.
• They are not affected by the change in person i.e. first, second or third form.
• Present Participle or Past Participle form of a verb is never used with a modal.

Use of Will:

1. The use of will in second and third person denotes pure future actions, With first person, will denotes threat, warning, promise or determination. e.g.

    (a) He will go tomorrow.

Will is also used for formal request.

    e.g. Will you close the door?

In the question : -

1. I _______ probably go out tonight. 

In this sentence , will is the correct modal that can be placed in the blank part as it is used to show the future tense .

2. This bottle ______ hold two liters of wine.

In this sentence , will is the correct modal that can be placed in the blank part as it is used to express capability .

3. I _______ pass my driving test.

In this sentence , will is the correct modal that can be placed in the blank part as it is used to express determination or insistence .

Thus , the Correct Option is C , which is will , will , will .