— Is it good to look up every new word when I come across it in reading?
—No，you _____，because you are likely to guess the meaning from the context,
A．don't have to B．shouldn't C．can't D．mustn't
---- Have you heard that Tom, as well as his parents, _____ moved to Beijing?
---- Really? No _____ I haven’t seen him for a long time.
A．have; doubt B．has; wonder
C．have; wonder D．has; choice
—I drove to Zhuhai for the air show last week.
—Is that ________ you had a few days off ?
A．where B．when C．what D．why
What is even more important is______ the earth cooled down, water began to appear on its surface.
A．that B．that as C．which D．which as
His idea was such a good one ______ we all agreed to use it.
A．as B．that C．so D．but
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A．are being uncovered B．have been uncovering
C．are uncovering D．have uncovered
