Although there were so many people in the square, I could ______ my friend.
| A．pick up | B．pick out | C．make up | D．set out |
It’s not until no enemies were left that they________ .
| A．did not stop fighting | B．did stop fighting |
| C．stopped fighting | D．have stopped fighting |
While playing ping-pong, our eyes see the ball coming, judge its speed and then hit it back ________ it should go.
| A．when | B．why | C．what | D．where |
I was about to leave my house________the phone rang.
| A．while | B．when | C．as | D．after |
.________they were singing, the teacher came in.
| A．Before | B．after | C．As | D．Until |
All that can be eaten _______ eaten up.
| A．are being | B．has been | C．had been | D．have been |