Not only his parents but also his brother ________ to the Summer Palace. They haven't been back.
The sentence needs _______ once more.
The computer centre, _______ last year, is very popular among the students in this school.
Rather than _______ on a crowded bus, he always prefers _______ a bicycle.
_______a reply, he decided to write again.
There seemed nothing else to do but ______ a doctor.