根据下列句子及所给汉语注释,写出空缺处各单词的正确形式,每空只写一词。
This kind of medicine is more useful than is (期待).
It’s my great dream to sail across the (太平洋) .
I have had her letter for two weeks. But I haven’t (答复) to her.
Many Chinese students have come to realize the (重要) of learning English.
It was reported that two (猴子) escaped from the zoo.