I have lost one of my gloves. I ______ it somewhere.
| A．must drop | B．must have dropped |
| C．must be dropping | D．must have been dropped |
__ is known to everybody, the moon travels round the earth every month.
| A．It | B．As | C．That | D．Which |
---I drove to Zhuhai for the air show last week.---Is that ___ you had a few days off?
| A．why | B．when | C．what | D．where |
What the doctor really doubts is ___ my mother will recover from the serious disease soon.
| A．when | B．how | C．whether | D．why |
The number of the employees has grown from 1000 to 1200.This means it has increased ___20 percent.
| A．by | B．at | C．to | D．with |
She was wandering what to do __ a policeman came and asked if he could help.
| A．while | B．as | C．after | D．when |