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
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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
17. They ( ) in the suburb when she was only a child.
A. lived
B. live
C. have lived
D. are living