In order to make students have a good knowledge of science subjects, they are encouraged to______ their own science experiments.
#83509
A
operate
B
direct
C
manage
D
conduct
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_________ first time I met him in his office, he shook me by _________ hand warmly and then introduce himself to me.
#83305
A
The; 不填
B
The; the
C
The; a
D
A; 不填
However, at times this balance in nature is disturbed by human activities, _______ a number of possibly unforeseen effects.
#65149
A
lying in
B
calling in
C
taking in
D
resulting in
Great changes _______ in our hometown since 1980
#65794
A
took place
B
have happened
C
has been taken place
D
have taken place
When I wanted to express my thanks to him，words _____ me. I just held his hands firmly and choked.
#70574
A
left
B
fled
C
forgot
D
escaped
We were told that ______ when Marx was already _______, he started to learn Russian.
#66439
A
in 1840’s; in his fifties
B
in the 1840’s; his fifties
C
in the 1840’s; in his fifties
D
the 1840’s; in his fifties