15. When Madam Curie did the experiment again, she was more careful where she _____ a mistake.
| A．made | B．has made | C．was making | D．had made |
It is the most instructive lecture that ________since I came to this school.
A attended B had attended C am attending D have attended
Do you wake up every morningenergetic and ready day?
A feel B to feel C feeling D fell
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