Jack, who pretended , heard, however, every word that was said.
A．not listening B．not to be listened C．not to be listening D．not having listened
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
Those the exam cheat must another exam tomorrow afternoon.
A．related to; get into B．absorbed in; get through
C．connected with; get over D．involved in; get through
He admitted a 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
