推荐回答（1个）
a piece of 为固定搭配。如a piece of news/information/cake. 加可数不可数名词都可以。
friends,应该用复数，因为前面是some of.
best，联系上下文，春天是去那里的 最好 的地方。而且这个空前面有the，提示用最高级。
interesting 修饰名词places
easily 修饰book，副词修饰动词。这里book不是名词，而作动词“预订”
on the Internet固定搭配
Although，表转折，虽然
fun It's fun to do sth. 固定搭配，注意不是funny，funny是指好笑的，放在这里不对
their物主代词
hearing look forward to +doing sth.因为这里to 是介词，介词后面加动名词。
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