Babies sleep l6 to l8 hours in every 24 hours, and they sleep less ________ they grow older.
| A．while | B．as | C．when | D．after |
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 |
The water in this glass is too hot. I prefer some cold______ water.
| A．to boil | B． having boiled | C． boiling | D． boiled |