We work together to achieve our common purpose: _______ world that is safer, cleaner and healthier than_______ one we are living in.
I still remember the college and the teachers ________ I visited in London years ago.
The people there have met lots of difficulties, but they haven't ________ hope.
I'm surprised to hear from her. ________, we last met ten years ago.
Thanks to the Internet, different kinds of information ________ in a short time.
-- Our school bus will leave at 8 o'clock tomorrow. Don't be late.-- OK. I will be there ten minutes________.