My mother didn’t expect ______ such a lovely present from me!
| A．receive | B．received | C．to receive | D．receiving |
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 |