Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. He always says that he will help, but when it comes to the crunch, he does nothing.

difficult time
confused situation
decisive moment
troublesome moment

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Idiom
Select the correct statement about active and passive immunity.

Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
Immunological memory is established by passive immunization
A vaccination is an example of the introduction of passive immunity into the body
The antibodies utilized in active immunity are acquired from another organism

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