By and by, _____ go out to contact other people in person, more and more people tend to socialize with others via electronic devices.
-----______you received the news ? ------Last night .
My parents have promised to come to see me before I ____for Africa.
The doctor persuaded the patient ____.Which statement is WRONG?
Don’t forget to examine the test paper you have just finished _____the possible mistakes in it .
The school _____you visited yesterday is the place ____I once learned .