______ I accepte the gift or refuse it is none of your business.
A. If
B. whether
C. When
D. How
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_______ certain that his invention will lead to the development of production.
A. That's
B. This is
C. It's
D. What's
________ still needs to be discussed.
A. How is the plan to be carried out
B. How the plan is carried out
C. Why is the plan carried out
D. Why the plan carried out
I wonder _____ he asked such a silly question in public.
A. how
B. what
C. that
D. why
He was interested in _______ he has seen at the exhibition.
A. which
B. that
C. all what
D. all that
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