–Look at that girl! Is it Susan? --No, it _______ be hers. She has gone back to her hometown.

——Must I leave the room now?——No，you    .

He ________ to swim when he was five.

—I don’t care what my teachers think．—Well，you________．

 It doesn’t look like rain, so you        bring your umbrella with you.

Have you decided where to spend your summer holiday?---Not yet.We       go to Qingdao.

—Is Jessica giving us a speech this evening?—No, it _________ be her．She _________ to Japan．

 -- What will the weather be like tomorrow? -- It ______ be rainy, cloudy or sunny. Who knows?

 —May I try on the jeans?—Yes, you        

―Must I report the situation of the new company to the manager now? ―No, you         . You are tired and you can do it after you have a good rest.

 -- Can I tell Peter about the news?-- No, I don’t want anyone else to know it. You ________ keep it to yourself. 

--Is the man standing outside the teacher’s office Mr. Zhou?  --No, it ______ be him. He has gone to Hong Kong for an academic conference. 

My uncle _________ drive a car two years ago. Now he drives very well. 

This book isn’t mine. ________can it be?

— Wow! You look different! You            wear glasses.— Yes, I did. But now I am wearing contact lenses(隐形眼镜).

Trees ____ fight air pollution．They are natural air conditioners．

 The red bike _______be Hu’s. She has a blue bike.

–Look at that girl! Is it Susan? --No, it _______ be her. She has gone back to her hometown.

 ---Must I do the work today? ---No, you _______. You may do it tomorrow.

You _______ see a dentist when you have a toothache.