It was in the lab___was taken charge of by our teacher____ they did the experiment.
| A．which; that | B．where; which | C．which; where | D．that;where |
Everyone, please remain ____ until the plane has come to a complete stop.
| A．seat | B．seated | C．seating | D．to seat |
I still remember ____ to the Summer Palace and what I saw there.
| A．taking | B．to take | C．to be taken | D．being taken |
Most birds find it __
__ to sleep in the trees.
| A．was safe | B．safe | C．to be safe | D．being safe |
Edward couldn’t remember when he first met Mr. Crook, but he was sure it was ____ Sunday because everybody was at ____ church.
---Would you mind if I take the seat?
--- _____.
| A．Yes, sit down, please |
| B．No, not at all |
| C．Surely, never mind |
| D．No, you can’t take it |