My uncle ________ some computer knowledge while he was on business in London. [ ]

Look! Some people are running the red lights.— We should wait ______ others are breaking the rule.

Chinese parents are always willing to do ________ they can for their children.

I thought horseback riding would be the sport for me until I fell down from the horse back .As you can imagine ,I haven’t been invited back

_ they may have, the CEO of thecorporation calls on all the staff to gather their courage to strive it.