Выбери правильный модальный глагол-
1.I_____Sing song
a) can. b) must. c) may

2.We_____ get up early on Sunday
a) can't. b) mustn't. c) can

3.My brother_____do his homework every day.
a) mustn't b) must. c) can

4._____I come in?
a) can. b) may. c) must

5._____I help you?
a) can. b) may. c) must

Помогите пожалуйста!!!