Jack isn't sure _______ students there are in his class.
A. how many
B. what
C. which
D. whether
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Can you tell me _______ yesterday?
A. what they do
B. what they did
C. what do they do
D. what did they do
I want to know _______ his homework yesterday evening.
A. if he finished
B. whether he had finished
C. had she finished
D. has she finished
Do you know what _______ this time yesterday?
A. they are doing
B. are they doing
C. they were doing
D. were they doing
Excuse me, can you tell me _______ ？
A. why was the train late
B. why the train was late
C. why is the train late
D. why the train is late
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