34. He had no sooner arrived there ________ pestering his doctor.
| A．and then he began | B．when he began | C．to begin | D．than he began |
The job was a great challenge and the bad weather _________ our difficulties．
| A．added to | B．added | C．added up to | D．added in |
It is said that this is the biggest lab ________ they have ever built in their school.
| A．which | B．what | C．不填 | D．where |
In order to attract more customers, many supermarkets usually sell their goods at a good________ at weekends.
| A．benefit | B．discount | C．interest | D．cost |
It will be at least three weeks________ he recovers from his illness and returns to work.
| A．before | B．when | C．since | D．after |
He found his house broken into and many things stolen _______ his return from office.
| A．with | B．in | C．at | D．on |