---- Tom came to work last Sunday, but no one has seen him since.
---- _____ he have had an accident?
| A．Must | B．Should | C．Might | D．Could |
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 |
When ________ imported goods，people are ________ about all the different labels on food these days.
| A．choosing；confused | B．choosing；confusing |
| C．chosen；frightening | D．choosing；frightened |