She owns a lot of books, most of _____ are written in English.
| A．them | B．which | C．what | D．that |
_______ all the inventions have in common is _____they have succeeded.
A. What; what B. That; that C. What; that D That; what
Only when I read this story for a second time to appreciate its beauty.
| A．had I began | B．that I began | C．I began | D．did I begin |
By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course．
| A．are | B．will have been | C．have been | D．will be |
The police are looking for a missing boy who is believed ______ a white pullover and blue jeans.
| A．wearing | B．to wear | C．to be wearing | D．having worn |
To _____ good relationships with your teachers and classmates ,you should learn to share ups and downs with them.
| A．keep up | B．add up | C．bring up | D．take up. |