——Mom,what did your doctor say?—— He advised me to live _____ the air is fresher.in where B. in which C. the place where D. where
We can never expect ______ bluer sky unless we stop ______ industrial waste going into _____ atmosphere.
________that he made an obvious mistake,Jeff went on with his speech.
There is no doubt ________ those who work hard will succeed sooner or later.
There are many websites,________you can find almost all the necessary information.
If we _______ adequate preparations, the conference wouldn’t have been so successful.