When did your parents __________— They ___________ for 20 years.

22Your performance in the driving test didn’t reach the required standard —–__________, you failed

What are you going to do this weekend — Well, we’ll clean up the city parks ________ it rains..

The criminal, as well as some ______ people, was arrested by the police yesterday.

The factory ____ the students visited last week is the one ____ I have worked for thee years．