The number of foreign students attending Chinese universities____rising steadily since 1997.
—I’m going to Thailand this summer holiday.—
She always come to our help when we get into trouble ____ she is very busy.
He has three brothers, ________is a doctor.
As teenagers of the 21st century, we should be ready to _____ the challenge of society.
The reason _____ they held a party was _____ it was Sue’s birthday.