Choose the correct answer. 1 you …b… do your homework before you watch tv. a can't b should c shall 2 … i come in? it's rather cold out here. a should b may c must 3 you … water the plants this weekend; the look dry. a are able to b needn't c ought to 4 … you collect the children from school, please a must b will c may 5 … you play the piano? a can b must c should 6 i … buy some milk. there isn't any left. a mustn't b may c must 7 when … i call you? a shall b must c needn't 8 i … swim before i was able to walk. a might b could c can 9 you … walk to work. i'll give you a lift. a must b needn't c may 10 tim … be out. there are no lights on. a shall b should c must