15．– How cold it is! I wonder how grass survive under such heavy snow．
--Don’t worry．There is a lot of air in loose snow which _______．
| A．keeps out the cold | B．keeps the cold away |
| C．keep off the cold | D．keep the cold up |
The _______ are ten to one that we’ll win the match.
| A．opportunities | B．possibility |
| C．chances | D．ability |
He had no choice but to _________ an excuse to explain his being late.
| A．make out | B．make up |
| C．make up for | D．make over |
The old man said the accident _______ careless driving, so a lot of money________ be paid by the driver.
| A．was due to; was due to | B．due to; was due to |
| C．is due to; was due to | D．is due to; was dued to |
Bill was doing a lot of physical exercise to build up his______.
| A．ability | B．force | C．strength | D．mind |
Xi’an is ______ most beautiful tourist city and I believe I’ll come for _______ second time.
| A．the; a | B．a; a |
| C．the; the | D．a; the |