—I'll call you ______ I arrive in Shenzhen．
—Thanks, and good luck．
| A．while | B．until | C．as | D．once |
All the __________ blood must be tested for HIV and other infections, which is important for the patients.
【选项
| A．determined |
| B．donated |
| C．disabled |
| D．distributed |
They are considering __________ the house before the prices go up.
| A．purchase |
| B．purchasing |
| C．purchased |
| D．to purchase |
She has a gift for creating an atmosphere for her students __________ allows them to communicate freely with each other.
| A．which |
| B．where |
| C．what |
| D．who |
—You can have a pet dog, but suppose you get bored with it in a few days? __________ ？
—We won't, we promise!
| A．Then what |
| B．All right |
| C．How come |
| D．So what |
It sounds like something is wrong with the car's engine. __________，we'd better take it to the garage immediately.
| A．Otherwise |
| B．If not |
| C．But for that |
| D．If so |