______ 6 world powers have accepted ______ Iranian offer for talks on its disputed nuclear program.
| A．The; a | B．不填; an | C．The; an | D．不填; a |
His words puzzled me so much that I had a hard time trying to ______ what he really meant.
| A．make the most of | B．make sense of |
| C．make for | D．make up |
The fact has worried many scientists_______ the earth is becoming warmer and warmer these days.
| A．what | B．which | C．when | D．That |
Seeing the happy ______ of students playing basketball there, I can’t help thinking of my school years.
| A．view | B．sign | C．sense | D．Scene |
There are so many viruses on the Internet. If ______ accidentally, the viruses may make your computer break down.
| A．downloading | B．to be downloaded |
| C．downloaded | D．being downloaded |
I _______ to your party, but I was prevented by the heavy rain.
| A．had meant to come | B．was about coming |
| C．have meant to come | D．meant coming |