[ Tenses ]
Make sure you close all the windows _______.
A. before you leave
B. until you will leave
C. after you had left
D. when you left

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a, an, the, Zero Article › ViewRoentgen won ___ 1901 Nobel Prize.
a. a
b. an
c. the
d. X [Nothing]
Preposition of Time › View
We go to bed … midnight.
A. on
B. in
C. at
Grammar › ViewYou ______________ copy your friend’s homework, it’s wrong.
A. shouldn’t
B. must
C. have to
D. don’t have to
Past Tense › View
I ___ the party but Chris wanted to go home
A. enjoyed
B. was enjoying
C. enjoy
D. had enjoyed