.—Did Susanna visit you again ________ next year? —No, it was almost ten years before she came to see me ________ second time.
If anyone happens to drop in while I am out, _________ him or her leave a message.
With a lot of problems __________, the new government is now having a hard time.
Though I’ve tried very hard to improve my English, by no means ___________with my progress.
Science and technology have in important ways __________ the improvement of agricultural production.
Mr. Han, my neighbor, is always helping those who are in trouble without expecting anything __________.