Not until the heavy snow blocked the express ____ how serious the weather was.

My brother is good at math. ______ often helps me with my math study.

I watched ______ film Let thebullet fly with my friend last night. —Oh, really? It’s really ______interesting one.

Rome was not built in a day. You should set ______ goals and work hard to achieve them. [ ]

_____ being fun and good exercise, swimming is avery useful skill.