The air in our city is getting much_____ now than a few years ago.
A. clean B. cleaner
C. cleanest D. the cleanest
We have to stay at home_____ the bad weather.
A. but B. because C. because of D. although
If you see the cartoon film, it will make you_____.
A. to laugh B. laugh C. laughing D. laughed
_____ a good time we had yesterday!
A. Where B. How C. What D. Why
When winter comes, days get _____ .
A. long and long B. longer and longer
C. shorter and shorter D. short and short
_____ of the two books are very interesting, so I can't decide which one to choose.
A. All B. Both C. Either D. Any
