1. Old McDonald gave up smoking for a while, but soon _____ to his old ways.
A. returned B. returns
C. was retur ning D. had returned
2. It is said that plastics can be used to____ many things. Now people are used to____ plastics pr odu cts.
A. make; using
B. making; using
C. making; use
D. make; use
3. The new dictionaries are very useful. They ____ well and ______ already.
A. sell, have been sold out
B. sold, had sold out
C. sell, sell out
