Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
| A．the; a | B．a; a | C．/; a | D．/; the |
Sadly, Robinson lived in a time ______ strict rules controlled ______black American could do in that country.
| A．that/how | B．when/which |
| C．that/ what | D．when/what |
Though the thief tried every means, he couldn’t _____being caught by the policemen finally.
| A．help | B．escape | C．survive | D．consider |
–Joe, are you free now?
—No, but I _____my work, and it won’t take long, perhaps in fifteen minutes.
| A．just finished | B．have finished |
| C．am finishing | D．had finished |
Tim is one of the boys who _____ to join the school football team.
| A．have been chosen | B．has been chosen |
| C．was chosen | D．are being chosen |
The policemen entered a lonely village near Nam Co Lake, ______ they believed the suspect（嫌疑犯） was hidden somewhere.
| A．where | B．which | C．what | D．whom |