You’d better book the tickets in advance; _______ we may miss the concert. 

The Internet is increasingly accessible at school and at home. _____many parents and teachers are sometimes not as prepared as we should be to warn children about Internet threats.

--It’s reported that young people are responsible for 60% of the traffic accidents.---Exactly. Young drivers are far more _______ to drive faster than old ones.

 None of the students watched the teacher______.

Those who do exercise _____ in our club have showed amazing improvements in health and weight.