Many scholars share the belief that interest is as _____ to learning as the ability to understand, even more so to some degree.
| A．subtle | B．vital | C．similar | D．obvious |
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 |
Why ______ we eat outside ______ we have so much delicious food at home?
| A．must; when | B．can; while | C．will; as | D．should; though |