20.I didn't go to bed ________ my mother came back late last night.( )
| A. | so | B. | until | C. | though |
19."Is that boy Ken?""It ________ be him.He has gone to Zunyi."( )
| A. | must | B. | can't | C. | needn't |
18.People in Korea ________ bow when they meet for the first time.( )
| A. | supposed to | B. | are suppose to | C. | are supposed to |
17.Look!Some children ________ in the river.Let's go and join them.( )
| A. | swim | B. | are swimming | C. | will swim |
16.Sam and Danny are twins,________ parents teach English in Guiyang.( )
| A. | They | B. | Them | C. | Their |
15.-Something terrible.What goes bad in the kitchen?-The meat.( )
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| A. | looks | B. | tastes | C. | smells | D. | feels |