_______to sunlight for too much time will do harm to one’s skin.
________ the fire breaks out,he is the first to arrive at the scene.
—What do you think I should wear for such a formal press conference? —Dress ________ you like.
—Someone wants you on the phone. —________ nobody knows I am here.
We had to be patient because it ________ some time ________ we got the full results.
He was so deep in thought,thinking of the problem ________ he knocked into the tree without noticing it.