We laugh at jokes，but seldom about how they work．
A．we think B．think we C．we do think D．do we think
_____ playing dumb with teachers. They know very well their students.
A. It’s no use B. There is no doubt C. It’s no wonder D. There is no need
They thought my suggestion reasonable _______a few experts to help them.
A. that we sent B. we should send C. we would send D. that we send
_____but he still couldn’t understand the logical connection of the two subjects.
A. Having told many times B. Having been told many times
C. He was told many times D. Many times as he was told
It was not until he came back _____ he knew the police were looking for him.
A. which B. since C. that D. before
All her time _______ experiments, she has no time for films.
A. devoted to do B. devoted to doing C. devoting to doing D. is devoted to doing
