题目内容：

按照汉语提示或括号内单词的正确形式完成下列句子，每空一词。

1.There's no point in even ______ (attempt) an explanation — he'll never listen.

2.The new haircut ______ (transform) completely her into a fair lady yesterday.

3.The organization's aim is to ______ ( strength) the cultural ties between China and Germany.

4.The last few years have seen a ______ (平稳的) increase in the number of visitors.

5.Many ______ (潜在的) customers are waiting for a fall in prices before buying.