____ volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.
| A．Studied | B．To study | C．Having studied | D．Studying |
An independent traveler would like to struggle with maps and signs ____ he finds the way．
| A．since | B．until | C．before | D．when |
As soon as his teacher begins lecturing, he begins to doze off, not intentionally but _______.
| A．personally | B．randomly | C．habitually | D．unconditionally |
The Chinese lunar New Year usually ______ two records: the world's most watched television gala show, and its busiest telecommunications network.
| A．develops | B．witnesses | C．establishes | D．launches |
The world famous director, three of _____ movies won Oscar awards, is reported to have retired.
| A．whose | B．which | C．whom | D．his |
--Have you heard that he was awarded the Nobel Prize in Literature last year?
--______. He has made a positive contribution to that field.
| A．Congratulations | B．You must be joking | C．By no means | D．He deserves it |