64. If _______ , English teachers must pass the oral and written tests.
Mr. Black decided to give up his farm and devoted all his time to_______those children living on the street.
People ________do exercise every day have a better chance of staying healthy than those ________don’t.
----Sorry to say I can’t play basketball with you this afternoon, for I’ll have to prepare for the coming examination. -----________. Have some fun!
It was an exciting moment for these fans this year, _____ for the first time in years they saw their favorite singers.
He likes to sleep with the window ________ and the door ________ at night.