_____ they will go there to try another experiment hasn't been decided yet.
A. Whether
B. If
C. Why
D. Where
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No sooner had she arrived home______ he began to prepare the supper.
A. than
B. and
C. but
D. when
Hardly had the plane landed _____the people ran toward it.
A. but
B. till
C. and
D. when
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
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