Working hard is not only a_____ of a great success, but is among the essential requirement.
| A．sign | B．signal | C．guarantee | D．marks |
Some scientists believe that ________ is no doubt ________ a cure for AIDS will be found.
| A．it; that | B．it; whether |
| C．there; that | D．there; whether |
The teacher asked his students to leave a space in their exercise books ________.
| A．every a few lines | B．each a few lines |
| C．each few lines | D．every few lines |
The driver who died in the accident _________, but he didn’t wear the seat belt.
A. could survived B. could have survived
B. must survived D. must have survived
I can’t tell you the exact time when I’ll get there, maybe at 8 or 9 or later. __________, I’ll be there as early as I can.
| A．Thus | B．However |
| C．Anyhow | D．Therefore |
The headmaster will not permit the change in the course, nor _________ it a thought.
| A．does he even give | B．he even gives |
| C．he will even give | D．will he even give |