Is this research center _____ the foreign guests visited last week?
| A．that | B．which | C．where | D．the one |
“I don’t think it’s my _____ that the TV blew up. I just turned it on, that’s all,” said the boy.
| A．matter | B．mistake | C．fault | D．duty |
The deer ____when the animals , harmful to them, disappeared.
| A．multiplied | B．produced | C．laid | D．developed |
The students entered the classroom, smiling and _______, and _____ down to have their lessons.
| A．talked , sat | B．talking, sitting | C．talking , sat | D．talked; sitting |
If your knowledge can be in some way ______ with my experience， we are sure to succeed.
| A．joined | B．connected | C．united | D．combined |
If you put too many oranges in that paper-bag it will _____.
| A．spread | B．explode | C．crash | D．burst |