The Trojan War ______ by Helen and her beauty.
A. causes B. is caused C. caused D. was caused
When the teacher ______ how to do the experiment, the bell rang.
A. explains B. will explain C. was explaining D. is explaining
I ______ my mind to study harder since I visited the Shanghai Supercomputer Centre.
A. am making up B. have made up C. made up D. had made up
As a father, Einstein was just as ______ as any other father in the world.
A. kind B. kinder C. kindest D. the kindest
The cable Internet seems ______ than I expected.
A. quick B. quicker C. quickly D. more quickly
When you’ve learnt English, you’ll find it a bridge to so much ______.
A. knowledge B. tradition C. idea D. method
