______ the fact that she is still young, she is a remarkably fast runner.
| A．Give | B．Given | C．Giving | D．Gave |
--- 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 |
Sex education is a sensitive area for some parents, and thus it should remain _________.
| A．random | B．previous | C．optional | D．vital |