We can not figure out quite a number of insects, birds, and animals are dying out.
| A．that |
| B．as |
| C．why |
| D．when |
Don’t trouble to see me ______ the door I know my way out.
| A．to | B．in | C．off | D．outside |
Hiking by oneself can be fun and good for health.It may also be good for________building.
| A．respect | B．friendship | C．reputation | D．character |
Sophia waited for a reply, but ________ came.
| A．either | B．another | C．neither | D．none |
We should not________and laugh at those who have no homes to shelter from the rain and wind.Instead，we should be sympathetic of them.
| A．look forward to | B．think highly of |
| C．pay attention to | D．look down upon |
The film star wears sunglasses. Therefore, he can go shopping without ______.
| A．recognizing | B．being recognized |
| C．having recognized | D．having been recognized |