. There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.
| A．committing | B．attaching | C．comparing | D．relating |
Barry must have visited the Eiffel Tower before，________he?
| A．mustn’t | B．hadn’t |
| C．hasn’t | D．needn’t |
________，he talks a lot about his favorite singers after class.
| A．A quiet student as he may be |
| B．Quiet student as he may be |
| C．Be a quiet student as he may |
| D．Quiet as he may be a student |
________ and we’ll get everything ready for the taking off.
| A．Have one more hour |
| B．One more hour |
| C．Give one more hour |
| D．If we have one more hour |
Not until we have had a chance to discuss it thoroughly ________ perfectly.
| A．the problem has been settled |
| B．has the problem been settled |
| C．will the problem be settled |
| D．the problem was settled |
—Have you been to the Great Wall?
—Perhaps not in my memory.________，it might have been during my early childhood.
| A．If any | B．If so |
| C．If ever | D．If not |