If you ______ smoke, please go outside.

—Jim，you said you'd lend me your MP5.—I'm sorry I forgot my promise but you ________ have it next Saturday. 

---- ________ we go swimming in Xishuanghu Lake today?  ---- Oh, no. It’s ________ cold to swim on such days. I will catch a cold. 

--Who’s the man over there?Is it Mr Black?----It _____be him.He’s much taller.

—Must I finish my homework at school?— No, you_____. you can do it at home