The computer system ___suddenly while he was searching for information on the Internet.
The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.
__________ the students, the teacher came into the room smiling.
I have told you the truth. ______ I keep repeating it?A Must B Can C May D Will
Can you think of some cases ________ people can communicate only by means of body language?
A great number of students said they were forced to practise the piano.