—When did your cousin begin to show his interest in medicine?
—It was a Saturday ___ she noticed her uncle experimenting on a frog in his lab.
| A．that | B．what | C．when | D．which |
How much do you think that vase _____?
| A．is cost | B．used | C．was paid for | D．cost |
Do you know the name of the play ______ in the hall now?
| A．to be put on | B．being put on | C．put on | D．putting on |
The moment they got the money, they repairing the old temples.
| A．set out | B．set about | C．set off | D．start out |
. I’m afraid I’ll turn to Prof. Timlingson. It is .
| A．too difficult a problem | B．a too difficult problem |
| C．such difficult problem | D．a so difficult problem |
--- Excuse me, sir. Would you do me a favor?
--- Of course. What is it?
--- I _____ if you could tell me how to fill out this form.
| A．had wondered | B．was wondering | C．would wonder | D．did wonder |