1.  他努力学习,以便能够赶上其他同学.
    He works hard so ____ he can ____  __  with other students.
2.  我爷爷在十八岁时开始工作.
    My grandfather began to work ___  ___  ___  __ 18 ．
3．同学们正在一个接一个地上公共汽车.
   The students are getting on the bus ___  ___  ___.
4.  如果明天不下雨,我们就去公园.
   If it ___  ____ tomorrow, my family willgo to the park.
5.  越活动你的脚,你就会越健康.
   ___  ___ you move your feet,  ___  ___ you will be