He worked hard to ________ some money for his retirement.
—You don't seem to be quite yourself today. What's wrong? —Oh, I'm suffering from a cold. Nothing serious,
__________ you understand the rule, you will have no further difficulty.
I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
—He isn’t particular about his food. —Yes, he eats_____________ anything.
I lost my way in complete darkness and, matters worse, it began to rain.