D. Choose the correct modal verb.
1. Children mustn’t/ needn’t dive into the river. It’s dangerous.
2. She shouldn’t / should eat sweets if she wants to lose weight.
3. You must/could be over 18 to drive a car.
4. Helen may/ must go on a tour next summer if her parents give their permission.
5. We could/ couldn’t sleep last night because of the storm.
6. All teens have to /might stay in school until they are sixteen years of age.
7. Must/may I come in?
8. I can’t/can speak Spanish very well because I didn’t learn it at school.
9. If your roommates are too noisy, you ought to/need to study at the student library. It’s quiet there.
10. Girls will cook everything for the party, so boys don’t have to/ mustn’t bring any food.

1. She is not working, she is swimming in the river. 2. Someone is knocking at the door. Shall I answer it? — I am coming in a minute. I am just washing my hands. 3. It is a lovely day. The sun is shining and the birds are singing. 4. You can’t see Tom now: he is having a bath. 5. She is always losing her glasses and asking me to look for them. 6. We are having breakfast at 8.00 tomorrow as Tom is catching an early train. 7. I am wearing my sunglasses today because the sun is very strong. 8. The last train is leaving (leaves) the station at 11:30.

1 The body requires fuel in the form of oxygen and food.
2 No, it can`t
3 The processing`s called digestion
4 Enzymes`re certain substances which are made by the body (and mixed with the food passing through the body)
5 Our food consists of protein, carbohydrate, fat and small quantities of vitamins and minerals
6 They (proteins) are found in meat, fish, eggs, cheese and milk
7 They`re necessary for cell growth and repair
8 Carbohydrates provide body cells with the energy required to perform their functions
9 Body fat`s stored in a layer beneath the skin
10 It acts as a reserve source of energy when needed and also as insulation, helping maintain body temperature in cold weather
11 It`s necessary for us to drink more than a liter of fluid daily