believe in those ads that you canmaster a language in one month. Instead, it is a _______process, which maylast for years.
We have no time to play. We have _________ homework to do.
You can’t imagine _______ great fun chattingonline is.– Really But it may cause you a lot oftrouble.
in harbor is safe, but that’s not ______ ships are built for.
No sooner ____ to the station ____ the train left.