The train is running ______120 kilometres an hour.
#12948
A
at a speed
B
at the speed
C
at a speed of
D
on a speed of
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Audiences were greatly ______ by the video class about weightless conditions _____ in Tianggon-1 space station. 
#12405
A
impressing; presenting
B
impressed; presenting
C
impressing; presented
D
impressed; presented
I ________ watching television; let’s go for a walk.
#12355
A
am concerned about
B
fall in love
C
am fond of
D
am tired of