1.Jack _____ his keys in the office ,so he had to wait until

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1.Jack _____ his keys in the office ,so he had to wait until his wife _____ home.
A.had left;comes B.left; had come C.had left ;come D.had left ;would come
2.He (made up his nind to ) study hard and go into the best university in China .
A.learned it by heart to B.had a decision to
C.tried his best to D.planted to do
3.Water pollution is one cause of the _____(die) of the fish in the river.
4.Anna is better ____ math than any _____ her classmates.
A.for; other of B.at; other of C.for ;of D.at ;of
5.The film I saw yesterday is the best one _____ I've ever seen .
A .that B.which C.what D.of which

1.C
2.B
3.death
4.B
5.B

Bob had left his keys in the office,so he had to wait until Helen _____ her keys in the office so she had to wait until Helen ( ) her keys in the office so she had to wait until he Mr Black ___(leave) his keys in the office,so he had to wait Helen___her keys in the office,so she had to wait until her Mrs Smith____her keys in the office.so she had to wait until Helen___her keys in the office so she had to wait until her Helen had left her keys in the office so she had to wait unt Helen had lost her keys in the office so she had to wait unt 英语15.Helen _______ her keys in the office so she had to wait 16.Mrs Smith----- her keys in the office so she had to wait Helen _______ her keys in the office so she had to wait unti