All of us found ______ difficult to work out the maths problem.
| A．what | B．that | C．which | D．it |
In the factory women _______ 44% of the workforce , and nearly half the mothers with children are in paid work.
| A．build up | B．set up | C．make up | D．take up |
What you said just now______ me of that American professor.
| A．mentioned | B．informed | C．reminded | D．memorized |
The invention of the typewriter was a great_______ to communication and printing.
| A．contribution | B．devotion | C．revolution | D． construction |
.He is a new comer in the team, but I have the______ that I have seen that man before.
| A．decision | B． situation | C．impression | D．position |
We would like to drop in at your house if ___________
| A．you are convenient |
| B．it is convenient of you |
| C．it is convenient to you |
| D．you will be convenient |