1/ Mary couldn’t ......................... to the meeting this morning. A. come B. to come C. coming D.came 2/ Jack should ....................... harder. A. studies B. to study C. study D. studying 3/ The whole team must ...... together to win the game. A. worked B. to work C. work D. working 4/ To stay alive, people ................... breathe oxygen. A. must/have to B. must not C. dont have to 5/ My room is a mess, but I .............. clean it before I go out tonight. I can do it in the morning.

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