Miss Li _ as a secretary for five years in the company, and now she is general manager of it.
| A．serves | B．served | C．had served | D．has served |
___ well prepared you are , you still need a lot of luck in mountain climbing.
| A．however | B．whatever | C．no matter | D．although |
We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.
| A．since | B．if | C．unless | D．until |
—Did you return Fred’s call?
—I didn’t need to ____ I’ll see him tomorrow.
| A．though | B．unless |
| C．when | D．because |
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．Although | B．As long as | C．If only | D．As soon as |