Sure! Here are the completions for the conversation and the sentences:

### 8. Complete the conversation using shall, will, or the correct form of be going to.

A: Your garden needs tidying.
B: I know. I (1) **will** do it this afternoon.
A: Can I (2) **lend** you my gardening tools?
B: Thank you! I (3) **am going to** visit my brother this afternoon, so I (4) **can** bring them to you now, if you like.

### 9. Complete the sentences with one of the modal verbs from the list.

1. She **couldn’t** dance at the party because she had a broken leg.
2. Your father is sleeping. You **mustn't** be noisy.
3. Birds **can** fly.
4. He is late; he **must** run to school.
5. We **should** book a table in the restaurant. John has already booked one for us.
6. If you are not feeling well, you **should** see a doctor.
7. She **can’t** come to the party but she isn’t sure yet.
8. He **can’t** drive a car; he is too young.

### 10. Fill in the gaps with the correct form of the verbs in brackets.

1. If she **(arrive)** early, we **will get** to the theatre on time.
2. If you **(heat)** it, it **will melt**.
3. If Tim **(have)** a computer, he **will use** the internet.
4. If you **(not put)** on sun cream, you **will get** a sunburn.
5. If I **(go)** to Spain, I **will watch** a flamenco performance.
6. If you **(freeze)** water, it **will become** ice.
7. If you **(be)** younger, he **will exercise** more.
8. If I **(be)** you, I **would see** a doctor immediately.

Feel free to ask if you need any further assistance!