1. I’m bored _______sleeping and watching TV all day.
A. up B. of C. with D. about
2. This laptop is much more user-friendly, but it costs __________ the other one.
A. as many as B. twice many C. twice as much as D. so much as
3. It__________ rain this evening. Why don't you take an umbrella?
A. could be B. must C. might D. had better
4. Environmental _________ is a serious problem facing mankind today.
A. pollution B. pollute C. polluted D. polluting