Nowadays,scientists are working hard to find a best way of treating addictions ________ drugs.
She hurriedly left the room as if ___.
—She may not be free today.—___, we’ll have to put the meeting off.
—Is your mother going to the supermarket ?—No, ____.
—Did you visit the museum last week ?—No, we ___, but we spent too much time shopping.
Who can you turn to in time of danger, if not ___?