The Russian rocket designer has died. For many years, he ______ as an important assistant to the father of Soviet space program.
| A．serves | B．was serving | C．served | D．has served |
This is the third book that he has written in the past five years, the first of I really enjoyed.
| A．which | B．that | C．those | D．them |
I’ve alwaysDeng Xiaoping for his courage' and degeneration to push China forward
| A．looked down on | B．looked up to |
| C．looked around for | D．looked forward to |
Do you know that the meeting _this afternoon has been put till next week?
| A．to be held; off | B．to be held; forward |
| C．held; off | D．held; forward |
---You didn’t lock the back door.
一You are wrong．I.
| A．have locked it | B．lock it myself | C．did lock it | D．do lock it |
Companies in Zhongguancun all have their own characteristics, but they all sharespirit of creativity and scientific skill that have made Zhongguancun
success．
| A．the; a | B．不填; a | C．the;不填 | D．a；a |