I won’t go to his birthday without _______.
| A．inviting | B．being invited | C．invited | D．to be invited |
The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
| A．served | B．serves | C．is serving | D．has served |
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
| A．after | B．before | C．since | D．when |
Thosethe exam cheat mustanother exam tomorrow afternoon.
| A．related to; get into | B．absorbed in; get through |
| C．connected with; get over | D．involved in; get through |
He admitteda lie in order to avoid.
| A．having told ;punishing | B．telling ;punished |
| C．to have told ;being punished | D．having told ;being punished |
I your success although you are in difficulty now.
| A．am sure of | B．make sure | C．am sure that | D．make sure that |