1 . The reason ______ this task was difficult was that the team had limited resources. (用适当的词填空)

2 . Please tell me the reason ________ you refused to take my advice. (用适当的词填空)

3 . This is the reason __________ he was absent from school yesterday. (用适当的词填空)

4 . Is this the reason __________ he refused our help? (用适当的词填空)

5 . The reason ________ he resigned was that he didn’t get on well with the boss. (用适当的词填空)

6 . The reason ______ he attempts to help those ______ make every effort to preserve the cultural heritage is that he thinks it worthwhile. (用适当的词填空)

7 . The reason ________ he told the teacher ________ he was late was that he got up late. (用适当的词填空)

8 . There is another reason ________ sleeping with pets all night may not be good for your health.(用适当的词填空)

9 . Please tell me the reason _______he was late.(用适当的词填空)

10 . There are many reasons_________ English is so widely used around the world in the fields of science, business, and more. (用适当的词填空)