Police in America have stepped up their search for a fifteen-year-old boy who went _____ three days ago.
| A．going | B．losing |
| C．missing | D．disappearing |
.
--- You are always getting angry with your little brother.
--- I know it’s not good, but I just can’t help__________.
| A．him | B．it | C．that | D．this |
.
Car racing is an adventurous sport, popular with young men, __________quick mind and skill matters much more than anything else.
| A．where | B．what | C．when | D．that |
.
The second half of his voyage was__________dangerous part, during which he sailed round the Cape Horn.
| A．more | B．most | C．the most | D．the more |
.
--- Are you going to stay overnight?
--- Not__________it’s really necessary.
| A．if | B．unless | C．until | D．since |
.
A volunteer is a person willing to help others, one who offers to do something without__________.
| A．paying | B．paid | C．being paid | D．to pay |