_____ they are very tired, they feel happy because they’ve finally finished their project.
#58350
A
So
B
Although
C
If
D
But
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—It’s very hot in the room! --_______ the door open?
#55563
A
Why don’t keep
B
Why don’t to keep
C
Why not keep
D
Why not you to keep
I will never forget that terrible accident _______ it happened so long  ago.
#58094
A
even though
B
so that
C
only when
D
ever since
Give me your telephone number ____I need your help.
#57994
A
whether
B
unless
C
so that
D
in case