Haier Company produced a new type of refrigerator of high quality and pretty appearance; its only ___is that it takes up too much room.
| A．advantage | B．drawback | C．profit | D．mistake |
10. I’m told that languagepractising.com is a free website ______ learners can not just learn various languages but also chat online.
| A．where | B．which | C．that | D．What |
9. 
The flowers were so lovely that they ______ out in no time.
| A．sold | B．had sold | C．were sold | D．had been sold |
8. He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it.
| A．when | B．while | C．because | D．That |
7. In Beijing Olympics, Michael Phelps swam into Olympic history, ______ the first athlete to win the most gold medals ever.
| A．became | B．becoming | C．becomes | D．to become |
6. He is a talkative man, but he didn’t say a word in today’s discussion. I am not sure how to ______ his silence.
| A．treat | B．master | C．read | D．Grasp |