He is so busy with the research he has no time left for any other activity.
| A．which | B．that | C．why | D．because |
No one ________ be compared with Yao Ming in playing basketball.
A can B need C must D. might
In 1492, Columbus_______ on one of the Bahama Islands, but he mistook it for an island of India.
A lands B landedC has landed D had landed
One-third of the country ______ covered with trees and the majority of the citizens black people.
A. is; are B is; is C are; are D are; is
Julie was good at German, French and Russian, all of ____ she spoke fluently.
| A．who | B．whom | C．which | D．that |
I know that _____ would over discourage him; he would never give up to be a director.
| A．something | B．anything | C．everything | D．nothing |