Not having worked out the program, ________ leave the office.
| A．so he was forbidden to | B．and he didn’t want to |
| C．his little son couldn’t make him | D．be couldn’t free himself to |
_____ environmental damage is done does it take many years for the ecosystem to recover.
| A．Even if | B．While | C．Only if | D．Once |
The student’s mind is always _____ when he listens to his teacher.
| A．wondering | B．wandering | C．wondered | D．wandered |
—Do you know who the young man is beside the door?
—A man _____ himself Jason.
| A．called | B．calls | C．calling | D．being called |
—Why did your team lose the game?
—They had a big advantage _____ us —— _____ so much taller.
| A．above; are | B．over; being | C．of; were | D．than; being |
I have done everything _____ was possible to do to prevent him from _____ the risk but in vain.
| A．it; cutting | B．which; running | C．that; cutting | D．it; running |