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You … use your mobile phone in the cinema.

A. mustn’t

B. don’t have to

We use will to express future actions decided at the moment of speaking.

A. TRUE

B. FALSE

They ______ for half an hour before the teacher arrived.

A. had been studying

B. worked

C. had worked

a substance that is present at the end of a chemical reaction

A. reactant

B. solution

C. solvent

D. product