Recently people have made great progress in using ____ power of nature to produce____ electricity.
.He was removed from the company,for he couldn’this way of life to the rest.
Although he is always coming on time,he is usedlate for his class.
Although the causes of cancer ____we do not yet have any practical way to prevent it.
These wild flowers are so special that I would do ____I can to save them.
The computer system____ suddenly while he was searching for information on the Internet.