1. Complete the sentences with the given modal verbs:
can, can't, must, mustn't, should, shouldn't
1) We ... find life on another planet.
2) People ... live on the Moon.
play hockey in summer.
4) Sharks ... be dangerous.
5) Doctors ... find a cure for cancer.
6) Parents ... understand their children perfectly.
7) We ... read at the table when we eat.
8) The youngsters ... say “NO” to drugs.
9) Kids ... see horror films after midnight.
10)We ... quarrel with our best friends.
11) Students ... cheat during their tests and exams.
12)Children ... play computer games.
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