. Professor Smith and Professor Brown will _____ in giving the class lectures.
| A．exchange | B．alter | C．shift | D．alternate |
She ______ her position as principal by giving jobs to her friends, which was severely criticized by fellow teachers.
| A．adored | B．overlooked | C．sought | D．abused |
It shames me to say it, but I told a lie when ______ by my head teacher why I was late for school.
| A．questioning | B．having questioned |
| C．questioned | D．to be questioned |
______ it rain tomorrow, we would have to put off the sports meeting.
| A．Were | B．Should | C．Would | D．Could |
Tom seldom, ______, paid for the software on his computer. That is, he used lots of pirated software.
| A．if any | B．if ever | C．if some | D．if never |
It was not until I visited Venice ______ it really worthy of the reputation of “the water world”.
| A．that I found | B．had I found |
| C．when I did find | D．did I find |