爱心是冬日里的一片阳光，使饥寒交迫的人分外感到人间的温暖。

爱心是沙漠中的一泓泉水，使濒临绝境的人重新看到生活的希望。

爱心是____，使____。

爱心是____，使____。

    Early this morning we all went to the Future Hall to have our graduation ceremony. The headmaster made a wonderful speech, and many of us ____ (move) to tears.

    Now the ceremony is over. We will leave school soon. I feel very excited because I am one of the best ____ (graduate). At the same time, I am a little sad because I have to say goodbye to my classmates and teachers. I want ____ (take) some photos with them and I will give some gifts to my teachers as well. In the past three years, I ____ (have) a great time in Red Star International School. I have learnt not only how to study, but also how to be a man. In ____ future, I will work much ____ (hard). I hope I can be an astronaut when I ____ (grow) up.

    Maria, Jane and Michael ____(go) back to their hometowns tomorrow and I will see them off at the airport. We will keep in touch ____ each other by sending emails, making telephone calls or writing letters. We will be good friends forever. I wish my classmates and teachers health, ____（happy） and good luck.

You can't imagine ________ difficult the road to success is.

果蝇是昆虫纲的一种小型蝇类，在制醋和有水果的地方常常可以见到．从科学史上看，它在近一个世纪以来的生物学舞台上占有举足轻重的地位，不论在已往、现在和将来，都将为人类探索生命科学的真谛做出不可磨灭的贡献．请观察并分析回答：