---What is our earth like ________from the moon?
---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
| A．seen; covering | B．seen; to cover |
| C．seeing; covered | D．seeing; covering |
—I rang you at about nine，but there was no reply．
—Oh，that was probablyI was seeing the doctor．
| A．why | B．when | C．what | D．that |
Is there a cinema aroundI can see a movie?
| A．that | B．which | C．where | D．what |
—John，when shall we meet again，Thursday or Friday?
—．I'll be off to London then．
| A．Either | B．None | C．Both | D．Neither |
What an unforgettable experience! I'll write it downit is still fresh in my memory．
| A．since | B．while | C．after | D．until |
—Do you think I should accept his invitation，Jim?
—．If I were you．I certainly would．
| A．None of your business． | B．It depends． |
| C．Why not? | D．I don't think so． |