______ the speaker can’t come, we’ll have to cancel the meeting.
A. Since
B. Until
C. Although
D. But
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You can go out ______ you promise to be back before 11 o’clock.
A. because
B. as long as
C. though
D. while
I watched him ______ he disappeared from sight in the distance.
A. unless
B. until
C. as
D. when
His diligence was ______ he made great progress.
A. so that
B. such that
C. in order that
D. so as that
______ he entered the university, his English has been much improved.
A. Before
B. After
C. When
D. Since