21 Read the text below and think of the word which best fits each space. Use only one word in each space. There is an example (0) at the beginning.

Looking 0) for a way to improve your health? Adding green tea 1) ............... your diet may be the answer. In recent studies, green tea 2)............... proved to be beneficial to our health, confirming 3).......... least 4,000 years of medical practice in Asia. It is the second 4)......... common drink in the world and could also be 5)........... most valuable substance you can take 6)............... protect your general health. Studies have shown that people 7)......... drink green tea have a lower risk of suffering from many diseases, 8)………. as cancer and heart diseases. Furthermore, green tea is very filling and curbs your appetite. It also aids in breaking 9) ........ body fat and lowering high blood sugar levels. Other advantages include the prevention of viruses and tooth decay. However, 10)......... order to reap the full protective benefits of green tea, you 11)...........to drink at least 5-10 cups a day. Green tea extract tablets are also 12)............ the market for those who want to get their daily dose, without having to drink so 13)......... cups. Green tea is sure to make 14)........... difference to , your eating habits and overall health. So, why 15).......... have a cup today?

Modal verbs

22 Read the sentences and match the verbs/modals in bold to their meanings.

Which express: obligation? prohibition? suggestion? necessity?

lack of necessity?

1 Surgeons must wear masks during an operation.

2 You ought to have an annual check-up.

3 You must clean your teeth every day.

4 You need to sleep for at least 7 hours a night.

5 You mustn’t smoke in here.

6 You don’t have to drive me to the station.

7 You shouldn’t be rude to your mother.

8 In the UK you have to be 17 to get a driving licence.

a It would be a good idea to do this.

b This is rude.

c You are not allowed to do this; it is forbidden.

d It is important that you do this.

e It’s not necessary, but you can if you want to.

f This is necessary.

g It would be a good idea not to do this.

h This is very important; it is essential.

23 Complete the second sentence so that it means the same as the first. Use one of the verbs in the box below. The first one is done for you.

can’t needn’t should mustn’t need shouldn’t must

1 It is essential to check in your luggage an hour before your flight.

You must check in your luggage an hour before your flight.

2 Smoking is forbidden in the youth hostel. You ................... smoke in the youth hostel.

3 It isn't necessary to take your own towel to that pool.

You................... take your own towel to that swimming pool.

4 Customers are advised to check their change before leaving the shop. You ................... check your change before leaving the shop.

5 It is impossible to get a ticket for the Cup Final. You ................... get a ticket for the Cup Final.

6 It is necessary for all children to learn to use a computer. All children ................... to learn to use a computer.

7 Students are advised not to leave all their revision until the day before the exam. Students ................... leave all their revision until the day before the exam.