The boy is only five years old，but he is quite used _____ the telephone．
| A．to answer | B．to answering | C．of answering | D．by answering |
13. ___ had they reached the 30th floor ____ they realized that they had forgotten to take the key.
| A．Hardly; than | B．Hardly; when | C．No sooner; when | D．No sooner; then |
12. Bungee is an adventurous sport, popular with young adults, ______ courage matters more than strength.
| A．where | B．that | C．of which | D．whose |
11. The public has complained that large quantities of waste water ______ into rivers without being cleaned, so large amounts of money ______ to solve the problem.
| A．have poured; is needed | B．has poured; are needed |
| C．have been poured; is needed | D．have been poured; are needed |
10. The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
| A．should | B．must | C．can | D．Will |
9. Many young people in the West are expected to leave ______ could be life's most important decision --- marriage --- almost entirely up to luck.
| A．as | B．what | C．which | D．That |