【题目】Mark Twain's (小说) The Adventures of Tom Sawyer is well received by children.

【题目】Sometimes tests are needed _________ doctors discover exactly what's wrong with your body.

【题目】The ability to make and use tools is one of the most basic characteristics of __________ it means to be human.

【题目】Children under sixteen is not (允许) to take part in this activity.

【题目】There (存在) a relationship between tourism and economic development.

【题目】The moment _________ I learned the results of the competition was one of the happiest times in my life.

【题目】—We need to turn to Professor Smith for help.

【题目】Had he taken his parent’s advice, he ______ having made such a silly mistake now.

【题目】The speaker tried hard to (使印象深刻) the audience but left them cold.

【题目】The government placed on the number of foreign cars that could be imported.