Jack opened the door, there_____ he had never seen before.
She is ______ new comer to _______ chemistry but she hasalready made some important discoveries.
---Jenny took the 8:00 bus to Guangzhou this morning. ---Really? She _______ the 9:00 train. It’s much more comfortable and safer to travel by train.
There is no doubt _______ the famous professor will come to give us a lecture.
It takes _______ money to help those who have suffered in flood; it also takes love.
---Did Peter fix the computer himself? ---He ________________, because he doesnt know much about computers.