Who ________ a theory about black holes?
| A．put forward | B．put down | C．put away | D．put off |
—I would like to speak to Mr. Martin.
—There’s nobody here by that name.
—Sorry, I ______ the wrong number.
| A．should have dialed | B．must dial |
| C．could have dialed | D．must have dialed |
Long skirts have been ______ for a long time in the West, but they are coming back this year.
| A．out of order | B．out of fashion |
| C．out of control | D．out of place |
—Will you please make yourself ______ to us, please?
—I’m the honorary chairman of the committee.
| A．know | B．to know | C．knowing | D．known |
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
| A．it | B．this | C．that | D．which |
Environmental experts point out that ______ some serious problems such as global warming, but it also could threaten human life.
| A．not only does increasing pollution cause |
| B．not only causes increasing pollution |
| C．not only increasing pollution causes |
| D．not only increasing pollution does cause |