You should study the laboratory guide before the exam. , , It is very cloudy; it might rain this afternoon. , , Students must turn off their cell phones during the exam. , , She could read when she was only four years old. , , I am not sure, but we may have a meeting on Monday. , ,  The engineer must check the structural plans. , , The surveyor can use the GPS equipment. , , You must not enter the construction area , .

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