All the students at school are required to ____ lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.
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A
join in
B
take part in
C
attend
D
participate in
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In the middle of the night, we ______signals for help from another ship. 
#84146
A
picked out
B
picked up
C
picked on
D
picked at
The visiting professor         giving lectures to students         invited to meetings at times.
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A
preferred; to being
B
preferred to; rather than
C
preferred; than being
D
preferred; than to being
This book       ten units,        three mainly revision.
#66165
A
contains; including
B
includes; containing
C
contains; containing
D
includes; including