As civilization __________，more and more people have realized the importance of preserving rare animals from dying out.
| A．stretches |
| B．spreads |
| C．extends |
| D．expands |
26．Newly-developed materials for spaceships can______extreme weather conditions.
| A．hold | B．support | C．stand | D．carry |
25．James Williams is my favorite professor; his speech is always brief, clear and_____the point.
| A．to | B．on | C．at | D．Of |
24．The first time I met David in the Central Park, both of us felt that we_____each other for ages.
| A．knew | B．have known | C．had known | D．Know |
23．---How much do I owe you for this beautiful vase?
---_____.It’s a gift.
| A．You’re welcome | B．That’s right | C．With pleasure | D．Forget it |
22．Despite the fact that Betty is a lovely girl, she____be extremely difficult to work with sometimes.
| A．must | B．should | C．would | D．Can |