In addition to keeping on taking ________ exercise, Alan is also going on ____ diet to lose weight.
| A．an; a | B．an; / | C．/; / | D．/; a |
It’s unfair! You sit there, listening to me, _____ I stand here, teaching you.
| A．as | B．when | C．while | D．since |
Only _____ our courage beats our fear ________________.
| A．when; can we succeed | B．if; we can succeed |
| C．because; will we succeed | D．while; we’ll be able to succeed |
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 |