1. We ....... cook tonight. Cindy has invited
us to dinner at her place
1) must have
2) don't have to
3) have to
2. You ....... to come with me. I can't go there on my own
1) have
2) must
3) should
3. We've ....... a wonderful new car
1) buy
2) bought
3) buying
4. I've been ....... do my homework?
1) think
2) thought
3) thinking
5. We ....... stop polluting the environment
1) don't have
2) have not
3) have to
6. They have been ....... up litter all morning
1) pick
2) picking
3) picks

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