Under the _____ confronting them it was impossible to continue the strike any longer.
[A] surroundings
[B] settings
[C] circumstances
[D] environments
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Although he thought he was helping us prepare the dinner, he was actually ________ the way.
[A] in
[B] by
[C] off
[D] on
The patient has been ________ of the safety of the operation.
[A] assured
[B] guaranteed
[C] entrusted
[D] confirmed
The tourist is prevented from entering a country if he does not have ________ passport.
[A] an operative
[B] a valid
[C] an efficient
[D] an effective
Why is it a problem if all the smaller fish species die?
A. It's not healthy for the environment.
B. People only like to catch big fish.
C. There are too many small fish.
D. The smaller fish can get lost in the lake.