She had an advantage over others because she had a good ________ of both Chinese and English.

Beer is the most popular drink among male drinkers, _____ overall consumption issignificantly higher than that of women.

_____? As far as I know, he never came late to class.

How long do you think ____ the computer company launches a new model?

Some students often drop litter carelessly in our school. What can we do?- We can _______ some signs to remind them not to do that again.