1.i don't think you have put enough ---------into it.

1.i don't think you have put enough _________into it.
A.thoughts B.thought
2.The effects of __________ are becoming more and more serious.
A.pollution to the environment B.pollution on the environment C.pollution for the environment
3.___________we want to ,we have to attend the party.
A.however or not B.countless of whether or not C.regardless of whether or not D.if or not
4.__________the movie 6 times before,he still enjoyed watching it
A.despite he watched B.despite watching C.in spite of he watched D.in spite of he watching
选什么,为什么,