It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
Water, _______enough, can change into vapour quickly.
The man stopped from time to time_______whether he was being followed.
Doctors have said that as many as 50% of patients don’t take medicine_______.
You may take them all home_______.
—Which would you like, chicken or fish? —_______