------the prices and functions of different types of cameras before you make up your wind which to buy
A.compare B.comparing C.compared D.to compare
Because the farmland -------quickly,the government is considering starting a program to solve the problem
A.is being lost B.is lost C.is losing D.loses
------a large group , your tone should be clear and loud.
A.when addressed B.while addressing C.when you address D.on addressing
------from being killed , the deer looked for a place where he could get food
A.to escape B.escaping C.having escaped D.to have escaped
No one knows -----prevented the fire from spreading
A.what was it that B.what it was thatC.howa it was that D.why it was that
请都详细写一下理由