You can’t be ______ when you camp _____ a high altitude, ________ the air is thin.
| A．enough careful; at; which | B．too careful; at; where |
| C．careful enough; on;at which | D．too careful; on; that |
There is no doubt ______the boxes were then put on a train .
| A．which | B．what | C．that | D．\ |
Yao Ming soon became part of the national team.
| A．a | B．the | C．an | D．\ |
Although it ________ as hard as ____stone, it easily melts when ______.
| A．feels…\...heated | B．feels…a...heated |
| C．is felt…a...heated | D．feels…\...heating |
Our English teacher is ill, and we are all ______ her health.
| A．careful of | B．concerned about | C．interested in | D．calm about |
Mrs. Johnson, our neighbor, often ______ the dog in the park after supper.
| A．watches | B．takes | C．keeps | D．walks |