What’s wrong with him? I haven’t seen him _____ last Wednesday.A. on B. since C. by
---________ is the population of your city? --- About seven ________. A. What; millions B. How many; millions C. What; million
Class, listen up! I have ________ to tell you. Please come here. A. anything good B. good something C. something good
If you are in trouble, why________ ask the police for help? A. not to B. don’t you C. not you
Please try________ late again next time. You should be on time. A. not to be B. not be C. to be
Guangzhou is ________ the south of China and is a very busy city. A. in B. on C. at