-- When do you need to pay the balance?
-- ______ December 31.
| A．In | B．By | C．During | D．Within |
With a lot of difficulties ___ , they went to the seashore and had a good rest.
| A．settled | B．settling | C．to settle | D．being settled |
The thief , they were happy to shout loudly.
| A．was caught | B．catching | C．having caught | D．caught |
This medicine will him of his cough.
| A．recover | B．cure | C．treat | D．heal |
Professor Hawking stepped into the office he knew that there was no hope.
| A．Unless | B．Now that | C．The moment | D．Although |
Under a big tree _______, half asleep.
| A．did sit a fat man | B．a fat man sat | C．did a fat man sit | D．sat a fat man |