As second-hand smoking is more harmful and dangerous, people want a total _____against smoking in public．
A．ban B．brake C．breakthrough D．boundary
—Won't you go shopping with your mother?
—No.________ she promises to buy me a new sweater.
A．Now that B．If only C．As though D．Unless
The result is very important.It is supposed ______ a secret between you and me.
A．to be kept B．to keep C．being kept D．keeping
Knowledge and learning are important if we want to be successful, but they may also ________our thinking.
A．direct B．limit C．change D．improve
The harder you ________， the better progress you ________.
A．will work; will make B．work; have made
C．work; will make D．will work; make
Professor Smith is now ________ the company, which was once________ Professor White.
A．in charge of; in charge of B．in charge of; in the charge of
C．in the charge of; in the charge of D．in the charge of; in charge of
