1£®We must try our best to protect endangered (endanger)species like the Siberian tigers.

2£®Power supply to the hall was cut off immediately£¬leaving (leave)the room in darkness.

3£®The car is worth repairing (repair)£¬so I suggest you should have it repaired.

4£®He can use the bicycle on condition that he returns it on time tomorrow.

5£®Today we have too many choices of communication through advanced technology, but we seem to_be_losing (lose)the joy of communicating face to face.

6£®If you still have any other questions, please put them down on your notebook.

7£®Although surprised (surprise)at the result of the exam, he looked very calm.

8£®As you know, it is our duty to protect our younger sisters from being_hurt  (hurt)when they are in trouble.

9£®The children talked so loudly at dining table that I had to struggle to_be_heard(hear)£®

10£®The young firefighters gave his life to_save (save)the baby, who was trapped in a burning house.