_______ any reply, he had to send a second request.[ ]

Ma Yingjiu, chairman of Chinese Kuomintang, expressed to the media his thought _________ the cross-straits would be united in time.

I went to return the book to Jack, but I couldn’t find him.—He ______ the library. You can find him there.

Can you tell me_____ difficult the exam turns out to be?

The little girl walks as if she _________ an old woman.