I found ______ possible to answer all the questions within the given time.
The police spotted a thief________ things in a mall at this time yesterday.
In most western countries, on April Fool’s Day, people often play __ ___ trick on each other; children especially have great ______ fun.
－I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.－_________! I’m sure you’ll make it.
Competitors are allowed to take a five-minute break every hour to eat，drink or do ________ is necessary
So far, all of the infected people are thought _______ the flu after direct contact with sick birds.
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