Had it not been for the haze（霾）weather phenomenon, there fewer car accidents in Beijing then．
| A．would have been | B．were |
| C．may be | D．would be |
I _________ here earlier, but I couldn’t catch the first bus.
| A．should come | B．have come | C．should be | D．should have come |
--- Where did you find Lily?
--- It is in the bookstore _________ she is working _________ I found her.
| A．in which; where | B．which; that | C．where; that | D．that; where |
When _________ where he had put the book, he kept silent.
| A．ask | B．asking | C．to ask | D．asked |
--- How often do you work out?
--- _________, but usually once a week.
| A．Have no idea. | B．It depends. | C．As usual. | D．Generally speaking. |
Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.
| A．in all | B．in turn | C．in advance | D．in short |