[填空题]Nothing can (do) ______unless the teacher gives us enough instructions.

[填空题]Nothing can (do) ______unless the teacher gives us enough instructions.

[单项选择]What can mouth guard do for us

What can mouth guard do for us
A．It can prevent our faces from being hit.
B．It can reduce the effect of shock to our teeth.
C．It can stop us from grinding our teeth.
D．It can make up for the damage we make to our teeth.
A. It can prevent our faces from being hit.
B. It can reduce the effect of shock to our teeth.
C. It can stop us from grinding our teeth.
D. It can make up for the damage we make to our teeth.

[填空题]Unless each person gives up a bit of freedom, no one can get along pleasantly with an other.

[填空题]Nothing can (do) _______unless we are given more information about the situation.

[单项选择]Not only （） us light, but also it gives us heat.
A. the sun gives
B. the sun does give
C. gives the sun
D. does the sun give

[填空题]Studies alone can conduct us to that enjoyment which is best in quality and infinite in quantity.
A. A．单独学习能传达我们所喜欢的质量最好和数量无限的东西。
B．学习能把我们带到高尚的、永无休止的娱乐之中。
C．学习本身就能把我们带到至高无上的、无穷无尽的欢乐境地。
D．全身心地学习会使我们在精神上得到激情和无限快乐。

[单项选择]There are several different methods that can be used to create a forecast. The method a forecaster chooses depends upon the experience of the forecaster, the amount of information available to the forecaster, the level of difficulty that the forecast situation presents, and the degree of accuracy or confidence needed in the forecast.
The first of these methods is the persistence method; the simplest way of producing a forecast. The persistence method assumes that the conditions at the time of the forecast will not Change. For example, if it is sunny and 87 degrees today, the persistence method predicts that it will be sunny and 87 degrees tomorrow. If two inches of rain fell today, the persistence method would predict two inches of rain for tomorrow. However, if weather conditions change significantly from day to day, the persistence method usually breaks down and is not the best forecasting method to use.
The trends method involves determining the speed and direction of move
A. if weather conditions change greatly from day to day.
B. if weather conditions do not change much.
C. on sunny days.
D. on rainy days.