My English teacher is strict _____ us.[ ]

When he got the news, he was ______ frightened ______ his leg couldn’t move.[ ]

Dad, must we wait until the light becomes green? — Yes, I’m afraid we ______. That’s the traffic rule.

Some scientists believe that is no doubt a cure for AIDS will be found.

I’m still working on my project.—Oh, you’ll miss the deadline（截止期限）. Time is________.