We were about to go out______ the rain poured down

Can you lend me the book ______the other day?

animals, ______ their size, breatheonce for every four heartbeats

Only when­­­­­­­­­­­­­­­­­___________ according to the directions can the medicine be quite effective.

If you be in time for the early bus , be sure to get up before five o’clock in the morning