A．inB．byC．atD．on

A．inB．onC．atD．to

The snakes will attack only if you take it ______ surprise.A．inB．byC．withD．on

The question is still ______ discussion.A．inB．byC．forD．under

【C6】A．inB．ofC．atD．to

There are trees ____ all shapes on the hill.A: inB: ofC: atD: by

【C8】A．inB．onC．atD．with