一、阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
1．The container ________(contain) many kinds of fruits, ________(include) pears.
2．The conference had been held to discuss the effects of tourism ________ the wildlife in the area.
3．It is very hard for Tom to work ________ such a difficult maths problem.
4．They count ________an honor to talk with the famous professor.
