(It) was (in) the classroom (which) we had class (meeting) yesterday.
A. It
B. in
C. which
D. meeting
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As (usually), when his parents (don"t) like what he (wears), they start to (bug) him.
A. usually
B. don"t
C. wears
D. bug
(No) one (knows) (that) the experiment will succeed (or not).
A. No
B. knows
C. that
D. or not
A typical English gentleman often takes an umbrella with him.
He is an (experienced) businessman; he has (engaging) in foreign (trade) for a few (years).
A. experienced
B. engaging
C. trade
D. years