In ___ year 751, the Chinese traveler Du Huan was taken __ _ prisoner by the Arabic army．
| A．a, the | B．/, the | C．the, a | D．the,/ |
Three fourths of the surface of the earth ______ covered with water.
| A．are | B．is | C．will be | D．was |
We finally bought a house, _________ about seven feet by ten.
| A．measured | B．measuring | C．is measured | D．measures |
The US is ___ number 7, while the UK is _____ the 13th position.
| A．on; in | B．in; at | C．at; in | D．of; on |
Why ______ we eat outside ______ we have so much delicious food at home?
| A．must; when | B．can; while | C．will; as | D．should; though |
We should follow the example of our parents, ______ more and taking less.
| A．hoping | B．doing | C．saying | D．giving |