You can never imagine what great difficulty I had ______ your house all by myself.
| A．found | B．finding |
| C．to find | D．for finding |
The science of medicine，__________progress has been very rapid lately，is perhaps the most important of all the sciences.
| A．to which | B．in which |
| C．which | D．with which |
Information has been put forward__________more middle school graduates will be admitted into universities.
| A．while | B．that | C．when | D．as |
I read about it in some book or other，does it matter__________it was？
| A．where | B．what | C．how | D．which |
I still remember__________this used to be a quiet village.
| A．when | B．how | C．where | D．what |
—I drove to Zhuhai for the air show last week.
—Is that__________you had a few days off?
| A．why | B．what | C．when | D．where |