—Why do you eat so little?—I’m _______ a diet to reduce some weight.
You' d sound a lot more polite if you make a request ______ a question.
Alone in the garden sat the girl, thinking, for a long time, of _______ life was like with her teachers and classmates in the past.
To ______ good relationships with your teachers and classmates, you should learn to share ups and downs with them.
—Do you still remember the first time you _______with a girl? —Not exactly, but I remember it was a Sunday.
There are altogether fifty-four students in our class, _____ is a new comer from a faraway mountain village.