No one was permitted ______ the empty house without his permission.
| A．entering | B．to enter | C．entering into | D．to enter into |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a |
| C．/; the | D．the; a |
I think that this meal was well worth ________ was charged for it.
| A．that | B．what | C．which | D．how many |
—The experiment is of particular importance.
—I see. We will carry on with it ________ we can get enough money.
| A．unless | B．though | C．whether | D．until |
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 |