The environment is getting worse in the present days, so the government must take _______ to stop people _______ too many trees.

Mike’s father, as well as his mother, commanded that he _____ home.

“_____ when does the pub stay open？”  “About midnight.”

_____ is not only what you do, but also how you do it that makes the difference.

When the fire fighters heard a lady     for help in the burning house, they rushed into save her.