The number of medical schools reached 18 in the early 1990s and ______ around that level ever since．（ ）
| A． |
are remaining |
B． |
have remained |
| C． |
is remaining |
D． |
has remained |
It ________ we had stayed together for a couple of weeks ________ I found we had a lot in common.
| A．was until; when |
| B．was until; that |
| C．was not until; when |
| D．was not until; that |
My former class teacher asked me to go and see him whenever _________.
| A．I will be convenient |
| B．it will be convenient |
| C．I am convenient |
| D．it is convenient |
It was two days before my mother flew to New York ______I arrived home.
| A．when | B．that |
| C．after | D．since |
Can’t it be in the drawer ______ you put your credit card?
| A．where | B．in which |
| C．there | D．that |
It was about tenminutes after we arrived at a small village __________ itbeganto pourdown．
| A．when | B．where | C．that | D．how |