______when China had to depend on western countries for advanced technology.A．Gone forever

We had to ________ a lot of noise when the childre

When they had finished playing, the children were made to ______ all the toys they had tak

He had hardly had time to finish the sound－recording ______ he turned off the radio.A．when

In China, when someone gives you a present, it’s thought impolite to open it ______.A

That was the second time that I______ to China.A．wentB．had beenC．would goD．will go

When I came through the customs at the airport, I had to pay______ on a clock I had bought