__________along the quiet road at forty miles an hour，and then an old man suddenly started to cross the road in front of me.
| A．Driving | B．I was driving |
| C．Having driven | D．When I was driving |
— Have you finished your essay?
— Half when you come back.
| A．has been done | B．will have been done | C．had been done | D．is done |
The visitor asked to have his picture taken _________ stood the famous tower.
| A．that | B．what | C．when | D．where |
Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.
| A．improve | B．to improving | C．improving | D．to improve |
Staying in a different country, just watch others to see _____ they act to decide what the best to say is.
| A．What | B．Why | C．how | D．when |
The cheering went on for quite some time _____ it died down and people took their seats again.
| A．Before | B．Since | C．As | D．when |