—Dad, I can’t open my e-dictionary in my computer.—You can _____ the computer and try again.
Bob’s singing ___song(歌曲)。It’s___American song.
__ your brother playing chess with Jack?
Elephants can remember the places ___food and water.
At school I___wear a uniform and I ___keep my hair short. A.can’t; have to B.have to ;must C.don’t have to;must
We ____or eat in class at school.