单词拼写

1. Difficulties will a ___as we do the work.

2. P____,I prefer to go to Beijing for my holiday.

3. Before going to school, all the children are given an ( 智力) test.

4.I haven't ____ ( 计算)the result of the maths problem.

5. Life ____    ( 完全地)changed when I went to college.

The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.

A.a continuous ringing for 10 seconds

B.one short ring followed by one long ring

C.two long rings of at least 20 seconds

D.a continuous ringing until the fire is extinguished