The most important thing about cotton in history is ______part that it played in ______ Industrial Revolution.
| A．不填；不填 | B．the; 不填 | C．the; the | D．a; the |
Jumping out of _______ train running at a speed of 200 kilometers per hour is quite _____ dangerous practice.
| A．/; the | B．/; a | C．a; a | D．the; the |
________ your spirits. Try again and you’ll succeed.
| A．Catch up | B．Catch on | C．Keep up | D．Keep |
As soon as Mr. Li came in, he asked Joan to ________ the books around the class.
| A．give up | B．give in | C．give out | D．give off |
Dogs are kept to ______ the houses from thieves at night.
| A．guard | B．defend | C．protect | D．prevent |
Because of the accident, the road was ________ to traffic.
| A．shut | B．closed | C．turned off | D．ended |