Rankings have become an inescapable part of the reputation of universities, _________them to attract students, staff and research investment.
| A．to help | B．helped | C．helping | D．help |
When people move to another country, they often try ________ the customs of their native land.
| A．to keep on | B．to keep off | C．to keep up | D．keeping up |
Although punctual himself, the professor was quite used ________ late for his lecture.
| A．to have students | B．for students’ being |
| C．for students to be | D．to students’ being |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a | C．/; the | D．the; a |
______ professional violinsit practises for several hours a day, but ______ violinist has his own way of playing the Beethoven concert.
| A．Each；every | B．Every；each | C．All；every | D．Either；every |
One more month，________these baby birds will fly out of their nest.
| A．or | B．and | C．but | D．otherwise |