—Robert is indeed a wise man.
—Oh，yes.How often I have regretted ______ his advice!
| A．to take | B．taking | C．not to take | D．not taking |
. —What do you think we can do for our aged parents?
—You ________ do anything except to be with them and be yourself.
| A．don’t have to | B．oughtn’t to | C．mustn’t | D．can’t |
His lack of professional knowledge _______for the failure of the experiment.
| A．accounted | B．explained | C．counted | D．contributed |
Not believing their eyes, the visitors on the spot _______ the flying plane, doing some most difficult and dangerous tricks in the sky.
| A．glared at | B．stared at | C．glanced at | D．caught sight of |
Many festivals are held _______ our ancestors for their contribution to the world.
| A．in honor of | B．in the honor of | C．in memory to | D．in the memory of |
She promised to ______ at the 
meeting but she didn’t ______.
| A．turn up; keep her word | B．present; keep her promise |
| C．attend; turn up | D．appear; keep her words |