12. The students ( ) basketball energetically on the palyground right now.
A. are playing
B. play
C. is played
D. played
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13. The bridge ( ) by the time you come back from abroad.
A. will be built
B. is built
C. will have been built
D. have been built
14. The children have already learnt from chemistry that water ( ) up of hydrogen and oxygen.
A. is made
B. was made
C. made
D. is making
15. She got angry with us and ( ）the room without saying goodbye.
A. leaves
B. was leaving
C. left
D. had left
16. I ( ) to repair the car while you were watching TV.
A. am trying
B. try
C. tried
D. was trying
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