_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ball
| A．Seen; covered | B．Seeing; covering |
| C．Seen; covering | D．Seeing; covered |
---How do you like the lecture by Mr. Lee?
---____________.
| A．By accident | B．Very boring |
| C．In the conference hall | D．By bicycle |
The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental_________ and severe cold.
| A．concerns | B．assumption |
| C．occupations | D．ignorance |
. ---Where did the couple find their child?
---It was in the park_________ the family used to camp.
| A．that | B．where | C．which | D．when |
He stayed up too late every night, _____ to catch up with his classmates.
| A．having determined | B．being determined |
| C．determined | D．to determine |
I like getting up very early in summer. The morning air is so good______.
| A．to breathe | B．to be breathed |
| C．breathing | D．being breathed |