根据括号中所给的汉语写出单词，使句子意思完整正确。

小题1: Sorry, sir! Those boots aren’t         (可找到的) in your size.

小题2:Spacemen have to__________(使固定) sleeping bags to the walls to prevent floating..

小题3:All the boys can’t wait to play basketball. They wish to begin      (立即) after class.

小题4:We can use many _________(交通工具) such as buses, cars and so on to go to or from work.

B.用括号中所给单词的适当形式完成下列句子。每空限填一词。

小题5:Little Tom is often very clever, but he makes an         （correct）answer this time.

小题6:When we got to the top of the mountain, we were tired and breathed __________(heavy).

小题7: Minnie is         (pretty) than any other mouse I’ve ever seen.

小题8:A hot topic that people are now talking about is the      (safe) of school bus these days.

型号为Y-112M-4的电动机，电源频率为60Hz，知其在额定运行条件下的转差率为5％，则该电动机的额定转速为（）r/min.

A.855

B.900

C.1710

D.1800