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Some of the students in this class seem ______ to help those who have difficulties in their studies.

The Web also provides an environment in which it is quick and easy to ______ ideas with colleagues.

I tried to put ____ a telephone call to him, but his line is always busy.

After 15 years in the United States, he has finally decided to　　　　American citizenship.

In the modern technological world the sea offers many ______ to help mankind survive.

电子商务中政府对企业的形式可称作（   ）。A. B to B       B. G to B         C. C to B     D. B to G

如果整型变量c、d的值分别为8和6，则下列语句中For I=c to d : Print I : Next I循环体的执行次数是（   ）。

如果整型变量a. b的值分别为3和1，则下列语句中For I=a to b : Print I : Next I循环体的执行次数是（   ）。

由“For i=1 To 16 Step 3”决定的循环结构被执行（   ）次。

如果整型变量c、d的值分别为10和5，则下列语句中For I=c to d : Print I : Next I 循环体的执行次数是（   ）。