2 . He must have ________ ________(经历) many difficulties before he succeeded. （根据汉语提示完成句子）

4 . 要是李昌不像往常一样到他店里吃饭,那问题一定严重了.
Something terrible _____ if Li Chang was not coming to eat in his restaurant as he always did.

5 . 普鲁士国王威廉一世决不可能想到他送给俄罗斯人民的厚礼会有这样一段令人惊讶的历史。
Frederick William I, the King of Prussia, ________ never ________ ________ that his greatest gift to the Russian people would have such an amazing history.

6 . The poor weather may have_____________the small crowd.(是...原因)

7 . 杰克昨天一定到达这儿了,对吗?
Jack_______________________