I think _____________ necessary to do some morning exercises every day.

下列各句中加线的成语使用不恰当的一句是（ ）

I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

I feel like __________. But there isn’tmuch time left, I’d rather we ______ a taxi.

What hot weather!一Yes. But it’s unusual experience for us. We once lived in a cold place.