When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping.
| A．that | B．where | C．which | D．when |
It ___ we had stay together for a couple of weeks ___ I found we had a lot in common.
A.was until; whenB was until; that
C. wasn’t until; when D. wasn’t until; that
No one can walk the wire in the air without a bit of fear unless ___ very young.
| A．having trained | B．trained |
| C．to be trained | D．being trained |
Neither the old lady nor her cats ___ out of the house since her husband passed away last month.
| A．was stepping | B．have stepped |
| C．stepped | D．has stepped |
After supper, he usually stood near the window, ___ he could see the tower, the tallest building of the town.
| A．from which | B．from where |
| C．on which | D．on where |
Jack is believed _____ his goal, who is said ____ the stage.
| A．to achieve; to leave |
| B．having achieved; to have left |
| C．to achieve; having left |
| D．to have achieved; to have left |