In China, people often feel_________to invite you to their weddings if you have invited them to yours earlier.
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When invited to a friend's home in America, you are expected to inform the host in advance in case of the ______in your arrival.
1.Not until we had reached the mountain top____how high we had climbed.
A) did we realize
B) we did realize
C) do we realize
D) we realize
2.The doctor told us it was a robot_____performed the surgery.
A) whom
B) that
C) which
D) what
3.If I_____the manual earlier, I would have been able to fix the machine.
A) got
B) get
C) have got
D) had got