Could I use your mobile phone now?
— Yes, of course you         .

－How could I thank you enough? －Don’t mention it. Any other man __________ that.

You _____ be 18 years old before you are allowed to drive a car ,and it’s also essential to get a driver’s license

How ________ they learn anything when they spend all their spare time watching television? 

She is already two hours late. What _________to her?

    the situation become worse, call me at once.

— Why didn’t you come to Mike’s birthday party yesterday?
— Well, I ____, but I forgot it.

34．Take the lift to the eighth floor and turn right. You_______have any trouble finding my office.

8．－This is a gas station! And you_________know smoking is forbidden here.
－Oh, terribly sorry.

14. ---- Is it Tom that playing basketball?
---- It __________ be him. He is so crazy about basketball.