It doesn’t often snow in my hometown in winter, but it ___be rather cold sometimes. 

No student       go out of school for snacks during the break without the teacher’s permission.

—Could I surf the Internet for twenty more minutes, Mum?—Oh, dear, if you________.

 --- You needn’t take an umbrella. It isn’t going to rain.--- Well, I don’t know. It     do.

—This pair of shoes ____ belong to Jack. He likes this kind very much.—It ____ be his. It’s too large for him.