If we didn't _________ any measures to protect whales, they would disappear forever.

A. Angry as was she, she managed to keep herself calm. 

C. Angry though she was, she managed to keep herself calm. 

D. Such was her anger that she managed to keep herself calm. 

A. Had Tom installed an alarm, his house wouldn't have been broken into. 

B. Tom had installed an alarm, the thieves wouldn't break into his house.

C. If Tom installed an alarm, the thieves wouldn't break into his house.

D. Tom wishes he would installed an alarm and the thieves wouldn't have broken into his house.

A. How lie detectors are used and their reliability 

A. How lie detectors are used and their reliability 

D. Lie detectors make innocent people nervous 

A. took

B. got

C. caught

D. had

A. No one has seen Linda for ages.                     

B. Linda is nowhere to be seen at the party.

C. The party is going on without Linda.