I know a little bit about the city as I __________ there for one year in my youth.
I've worked with children before, so I know what__________ in my new job.
Get down to the experiment right away if possible,__________ you will not finish it before dark.
---What do you think made Mary so upset? --- ______ her new bike.
Mr Reed made up his mind to devote all he had to______ some schools for poor children.
In some parts of London, missing a bus means ______for another hour. A. waiting B,to wait C.wait D. to be waiting