31. Lewis was much admired ______ his work on the advanced medical research.
| A．on | B．in | C．for | D．With |
—What’s the best way to reach you if I have a question during the day?
—I'm glad you ________. It’s best if you send me an email.
| A．ask | B．had asked | C．asked | D．were asking |
________ anyone come to my office, please tell them I'm not available before four o’clock.
| A．Might | B．Could | C．Would | D．Should |
Some friends persuaded me to apply to a combined M.D/Ph.D program ________ I could work in areas that wouldn’t be as open to me with only a Ph.D.
A. even if B. so that C. as if D. in that
When I try to understand ________ that prevents so many children from being happy, there seem to be three causes.
| A．why it is | B．what it does | C．why it does | D．what it is |
—What’s wrong with my computer, Jack?
—Let me have a check. OK, it works now.
—You mean, nothing wrong with it, ________ ?
| A．is there | B．isn’t there | C．is it | D．isn’t it |