--My computer ____start, no matter how hard I try.--It might have crashed.

- Look! It’s raining again.  -- Why _________it rain on Sundays? We are always staying inside! What a nuisance!.

 One of our rules is that every student          wear school uniform while at school.

—Who is speaking there? —It        be Uncle Li. He has gone to Shanghai.

— May I smoke here?— No, you ______ . This is a no-smoking room.