题目内容：

 

1.The New York Times ______ (be) first published in 1851.

2.The park was full of people, ______ (enjoy) themselves in the sunshine.

3.The thought came to him ______ maybe he should have said sorry to his father.

4.We heard them ______ (quarrel) throunghout dinner yesterday.

5.They are working together to make ______ they think is the best product.