_______ we need more practice is quite clear.
A. When
B. What
C. That
D. If
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______ I accepte the gift or refuse it is none of your business.
A. If
B. whether
C. When
D. How
_______ 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
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