Qiaozhi.

　　_______________________________________________________3．Over the past half century，using chemical fertilizers have become very common in farming.

　　_______________________________________________________4．I had as much fun sailing the seas as I now do worked with students.

　　_______________________________________________________5．I love the weekend，because I should not get up early on Saturdays and Sundays.

　　_______________________________________________________6．People love to get together to eat，drink and have a fun with each other.

　　_______________________________________________________7．The famous musician，together with his students，were invited to perform at the opening ceremony.

　　_______________________________________________________8．Unless some people are motivated by a need for success，others are motivated by a fear of failure.

　　_______________________________________________________9．The sun was shining brightly while we sailed downstream through a hilly college.

_______________________________________________________10．-The movie starts at 8∶30，and we can have a quick bite before we