We consider it important ___ he should keep healthy.
A. that
B. /
C. whether
D. if
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I know nothing about him except ______he is from the UK.
A. that
B. /
C. whether
D. if
I think______, as what you say, they should stay calm from time to time.
A. that
B. /
C. whether
D. if
He had learned the knowledge about mathematics and finance, but he doesn’t know ___ items it takes to start a business here.
A. how
B. what
C. when
D. which
Do you know why the system doesn't work?- Sorry, let's ask the engineer ____.
A. what is the matter
B. what the matter is
C. how is the matter
D. how the matter is