If it was not an accident, he must have done it .
Private cars are required to take turns off roads one out of five weekdays ____the traffic pressure.
With the speed up of the railway, now you can get to your destination by train.
Students should respect teachers and parents _______ just thinking for themselves.
The soccer team has been doing well this season,so they win the championship.
As we all know, ______ medcial examination will help out health problem as early as possible.