Hardly had the plane landed _____the people ran toward it.
A. but
B. till
C. and
D. when
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You must speak louder _______ you can be heard by all.
A. because
B. so
C. so that
D. that
He is _____ a young boy that he can’t go to school.
A. so
B. such
C. very
D. pretty
____ he opened the window, a sparrow flew in.
A. Though
B. The moment
C. If
D. Unless
Bad habits, _____ formed, are difficult to give up.
A. and
B. once
C. but
D. or