Thousands of rockets ______ with chemicals were fired into the sky to create the beautiful scenes in the Asian Games .

It is important that we        wild animals.

The Great Wall, _____ to be the longest wall in the world, runs across China like a huge dragon．

___________ made his mother worried.

The way you thought of _______ the experiment is very practical.

People today make choices of their diets______ what they believe.

They spent two months in the jungle, __________ on small animals and fruit.

At the routine office meeting, the headmaster insisted that the problems _________ paid special attention to.

With many major economic problems________ to be solved, there is no point predicting the growth rate of this year now.

She hesitated at the gate of the canteen, _________ whether to enter or not.