________ on ten years of observation and study, Professor Wang announced that
everyone dreams every night，whether they realize it or not.
A．Basing B．Based
C．Been based D．Having based
The air has leaked out of this football.Could you get it ________ up?
A．blow B．blowing C．blown D．to blow
________ the right decisions ________ the future is probably the most important things we'll ever do in our lives.
A．Making；concerned B．Made；concerning
C．To make；concerned D．Making；concerning
—What do you think made Celia so happy?
—________a prize in the recent competition.
A．As she won B．Won
C．Winning D．Because of winning
The wrong you have done to him is terrible，________， in my opinion，you should apologize to him.
A．which B．that
C．what D．for which
Those who have ________ floods and sandstorms know the importance of
environmental protection.
A．gone over B．gone through
C．got through D．got over
