The doctor prescribed the patient some drugs, which are effective against a range ___ bacteria.
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I’ll go swimming with you if I ________ free tomorrow.
A. will be
B. shall be
C. am
D. was
You should finish your lessons _______ you go out to play.
A. before
B. after
C. when
D. while
_______ I felt very tired, I tried to finish the work.
Although
Because
C. As
D. As if