Our teacher is always busy preparing lessons
until 11 o’clock at night, _______we students have gone to sleep.
| A．that time | B．by which time | C．by that time | D．which time |
Have you ___ the manager about taking a day off next week?
| A．balanced | B．recognized | C．approached | D．bothered |
The UK ____Great Britain and Northern Ireland.
| A．is consisted of | B．is made of | C．makes up | D．consists of |
You shouldn’t keep silent when ____
| A．speaking | B．spoken to | C．spoken | D．speaking to |
______ __ a reply, he decided to send another e-mail.
| A．Not receiving | B．Receiving not |
| C．Not having received | D．Having not received |
You should understand the traffic rule by now. You’ve had it ________ often enough.
| A．explaining | B．to explain | C．explain | D．explained |