（1）No one will be able to survive if the land，water and atmosphere are seriously polluted.

E

E

（2）When the fire happened，he was frightened and his mind was confused.

C

C

（3）During these two years they have attempted to conduct many scientific experiments.

B

B

（4）We eventually arrived at our destination.

D

D

（5）Fire fighters burst the door open and rescued them.

A

A

A.to save sb/sth from a dangerous or harmful situation
B.to make an effort or try to do sth，especially sth difficult
C.feeling fear；worried that sth bad might happen
D.at the end of a period of time or a series of events
E.to continue to live or exist