The World Trade Center has 110 storeys, _______ makes it the highest building in the city.

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A. that　　B. which　　 C. who　　 D. how

The frogs _____ feed mainly on insects are good for plants.

[    ] 　　

A. that　　B. what　　 C. when　　D. where

This experiment ought to ________ last weak .

[　　]

complete

[　　]

inspiring

[　　]

worth

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greatly

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找出与所给单词划线部分读音相同的选项

exactly

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It ________ John and Mary that often ________ me with my English study .

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Half of the plays put on recently ________ funny and interesting .

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