Water, which seems so simple and common, is _____ makes life possible.
. I forgot ________ my exercise-book with me, so I can’t lend it to you now.
Tom dropped in to see us on his way ________ home from the theater.
. Come _____. I’ll introduce my _____friend, Bob, to you.
I’m Mr. Brown from the police station. Could you tell me _____the butcher found moving slowly across the square?
. ---I am green at everything. ---Don’t worry. _____ you get older, you get more experience. A .When B. Till C. As D While