Water, which seems to be so simple and common, is ______ makes life possible.

Remember this, John. careful you are, mistakes you will make.—Thanks, Miss Rose.

These days I can only sleep for four or five hours at night as I’m too busy with my research work. –If you keep going on like that, you are sure to ______ sooner or later.

___ the exact departure time, he missed histrain

Did you take enough money with you? –No, I needed _______ I thought I would