He is one of the boys who _____ here on time. He is the only one of the boys who _____ here on time.
| A．has come; have come | B．have come; has come |
| C．has come; has come | D．have come; have come |
To keep fit, the old man makes it a rule _____ for a walk after supper every day．
| A．going | B．to go | C．go | D．gone |
--I'm sorry I made a mistake！
--__________Nobody is perfect．
| A．Take your time | B．You're right |
| C．Whatever you say | D．Take it easy |
One can always manage to do more things, no matter______ full one’s schedule is in life．
| A．how | B．what | C．when | D．where |
The police were seeking more information to find out________ killed the rich merchant．
| A．who it was that | B．who was it that |
| C．it was who | D．who was it |
Had they known what was coming next, they _________second thoughts．
| A．may have | B．could have |
| C．must have had | D．might have had |