Дано: ABCD - трапеция, OC < AO на 12 см, BC= 2 см, AD = 10 см. Найти: AC

Fill in must, mustn't, have to or needn't.

1. You_______ tidy your room every day.

2.________ I______ wash the doors, too?

3.You_________ wash the windows and you_____ dust the furniture either.

4.              Children______ touch switches.

5.                             A child______ eat some chocolates all atonce or he'll be sick.

6. You are much better and you_________ stay inhospital any longer.

7. If you are ill, you__________ go back to workfor two weeks.

8.              If you are not ill, you____ stay in bed all day.

9.                             You_____ go outside if you have a sore throat.

10.                     You____ smoke if you want to be healthy.

11.       You_____ drink alcohol. It's not useful.

12.       You_____ remember to take your medicineevery four hours.

13.    If you want to be healthy, you________ getvery tired.

14.    You_____ have any visitors if you don'twant to.

15.    You_____ leave hospital until the nursegives you all your medicine.