8He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it

There____many people____in the office, but now nobody is allowed to[ ]

I have ever found such a case________theson refused to support his mother when she became too old to feed herself.

he _____ is not known yet” “But when he____, he will be warmly welcomed”

My brother wants to be a policeman. He thinks it’s a little dangerous ______exciting.