In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
#28275
A
in
B
at
C
for
D
on
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In Hangzhou Mr. Black was so struck＿＿＿＿the beauty of nature that he stayed＿＿＿another night.
#28752
A
at； on
B
with； at
C
for； in
D
by； for
It was clear that the small grocer was _____ people he owed money to.
#28364
A
at the expense of
B
at the risk of
C
in the way of
D
at the mercy of
The two animals come from the same family but differ __ body shape and breeding habits.
#25792
A
with
B
from
C
in
D
of
20．We met _____ and have become good friends since then.
#28015
A
by mistake
B
by accident
C
by ourselves
D
by the way