The widespread of super-hybrid rice around the world ______the lives of millions and millions ofpeople suffering from hunger to a great level. [ ]

tists have found _____for oil as fuel. Coal, natural gas, solar power, nuclear power and even water can replace it as sources of energy.

John is going to Hong Kong. He is leavingon ______________ first week in June.

We ____ that the magazines you have borrowed be returned to the school library before the end of this month．

Mr Brook didn’t come back at the usual time last night ______, he met some friends and stayed out until midnight