Plastic and rubber won't _________ electricity,but copper will.
| A．have | B．do | C．pass | D．conduct |
—When I first got to Harvard, my awkward English brought me great trouble.
——Oh, dear, it _______a struggle for you to keep up with other students.
| A．might be | B．can be | C．could have been | D．must have been |
—Jack, did you see my son Harry just now?
—No，Mrs. White. I _______computer games.
| A．have played | B．am playing | C．had played | D．was playing |
Water, which seems so simple and common, is ______ makes life possible.
| A．what | B．that | C．which | D．how |
—Jimmy had a lot of parties recently.
—Yes, that might ______ why he didn't do well in the test.
| A．turn up | B．add up to | C．account for | D．make sense of |
—The weather isn't good enough for an outing, is it?
—Not in the least. We can't have ______ at this time of the year.
| A．a worse day | B．a nicer day | C．such bad a day | D．so fine a day |