1 . The rain storm was so violent, sweeping the whole city at an alarming rate, which was rarely seen at this time of year, _______ all the people on the street got caught and were wet through. (用适当的词填空)

2 . He became so weak from the loss of blood that_______ we started to think he would not come through.

A．at one time

B．at a time

C．time and again

D．at no time

3 . 他是一个忠实的倡导者，强烈倡导使用清洁能源，如太阳能、风能等，而不是使用那些污染我们环境的能源。（advocate，应用定语从句）
He is a devoted advocate, ________clean energies such as the energy of the sun, the wind and etc. ________using whose that pollute our environment.

5 . Please don’t ________ him.
请不要嘲笑他。

9 . Picasso gave Zhang 600 works in total, all of ________ were his imitations of Chinese paintings. (用适当的词填空)