When you are reading English novels, if you meet with some new words you can         this dictionary. Which of the following can’t be used in this sentence?

1. A.
   turn to
2. B.
   refer to
3. C.
   consult
4. D.
   look up

A class collects ＄50 to buy flowers for a classmate who is in the hospital. Roses cost ＄3 each， and carnations cost ＄2 each. No other flowers are to be used. How many different bouquets could be purchased for exactly ＄50？_______

Given BC=1,in a triangle（三角形）ABC, then the range of length of the side AB (or AC) is_____________________。

Never try to cheat in the exams, because if you do you will never         your ill behavior.

1. A.
   get away with
2. B.
   get along with
3. C.
   get out of
4. D.
   get into

Let a and be the length of two sides of a rectangle (矩形)，rotate(旋转)the rectangle about its
diagonal(对角线)，then the volume(体积) of the revolution(旋转休)  obtained is equal to________。

Suppose  the  least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is

A．

B．

C．or

D．or