I who ____ your teacher, will teach Marxism as a truth to you.
A. is
B. are
C. were
D. am
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____ they could do was to work hard.
All
B. All what
C. All which
D. That
It was not ____ he took off his dark glass ____ I realized who he was.
A. when; that
B. until; when
C. when; then
D. until; that
____ he is very good at numbers.
As he is a small boy
B. A small boy he is
C. A small boy as he is
D. Small boy as he is
____ Newton started to do experiments, he forgot about the time.
A. When
B. Once
C. If
D. As