____ hands and knees Helen Thayer got the tent up.
Was it on a lonely island __________ he was saved one month after the boat went down?
It was not until I came here __________ I realized this place was famous for not only its beauty but also its weather.
Father keeps impressing __________ me the importance of following others' advice wisely and correcting my mistakes in time.
—__________ he or his friends going to the party?—He as well as his friends __________ going.
It's the second time that I __________ in Shanghai ! What great changes have taken place in Shang Hai. It is ten years since I __________ it last time.