第1题：
In C program, all variables must be(70)before use, usually at the beginning of the function before any(71)statements.
A．stated
B．writed
C．illustrated
D．declared
第2题：
All deck cargo must be ______ in addition to being shored，blocked，and braced．
A.lashed
B.carefully prestowed
C.nested
D.properly supervised
第3题：
—It’s very important ___________ us to make a plan before a new term.
—Yes. You must try to make it carefully.
A. of B. for C. to
第4题：
第5题：
第6题：
Before any machinery is put in operation，you should ______.
A.ventilate all compartments，see that the machinery is clean and there are no obstructions
B.just turn the key and start up
C.take for granted that there are no fuel leaks
D.assume there are no volatile fumes in the engine space
第7题：
Before using a fixed CO2 system to fight an engine room fire, you must ______.
A.secure the engine room ventilation
B.secure the machinery in the engine room
C.evacuate all engine room personnel
D.All of the above
第8题：
All the mobile phones must before the meeting begins、
A、turn off
B、be turned off
C、be turning off
第9题：
第10题：