10.There is no d_________ about his honesty.

9.How do you feel animal experiments? Do you think it c_________.

8.Don't pull the cloth so hard.It _________(撕)easily.

7.Do you know what material _________(传导)electricity and heat best?

6.It usually takes four hours to get my cell phone fully c_________.

5.A condenser is used to collect and store e_________.

4.In the 18th and 19th centuries scientists made many important _________(发现).

3.Setting up a car factory here can help develop the e_________in this area.

2.Everything has its own advantages and d_________.

1.It's _________(不必要)to spend so much money on clothes.