7.As a teacher,I love being with my students.You can't imagine how much they knowledge!( )
| A. | are thirsty for | B. | are famous for | C. | are good for |
5.As close friends,they used to school together.( )
| A. | to walk | B. | walking | C. | to walking | D. | walk |
4.In the spoken English of some areas in the US,the"r"sounds at the end of the words .( )
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| A. | are dropped | B. | drop | ||
| C. | are being dropped | D. | have dropped |