what

12.

It was _________ back home after the experiments.

A.

not until midnight did he go                       B. until midnight that he didn’t go

C.

not until midnight that he went                   D. until midnight when he didn’t go

13.

It is the protection for the trees _________ really matters, rather than how many trees are planted.

A.

what                       B. that                       C. which         

       D.

we

14.

It was _________ he said _________ disappointed me.

A.

what; that                B. that; that                

C.

what; what   

      D.

that; what

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