In this country it is required that anyone who wants to settle here ______ to pass this kind of test.
| A．has | B．must have |
| C．have | D．will have |
I was so familiar with her that I recognized her voice ______ I picked up the phone.
| A．the moment | B．after |
| C．before | D．while |
You have to wear a helmet and a life jacket for protection, just ___ you fall into the water.
A. in case C. unless
C. though D. As
I toured the Great Wall，I was deeply impressed with the beautiful scenery．
| A．For the first time | B．At first |
| C．The first time | D．It was the first time |
He was about to leave the office for home _______someone knocked the door and asked for some help.
| A．until | B．while |
| C．as | D．when |
If you find yourself ______ no one will help you, please call me.
| A．which | B．when |
| C．where | D．what |