1. though you stay in the sea for weeks, you will not________________(失去联系)the outside world.
2. i have had great deal of trouble_________________________(跟得上班上的其他同学).
3. we should recognize that every company and every person is______________________(顾客和供应者漫长链条的一部分).
4. my brother was very ill, so _______________________ (我只得把医生请来) in the middle of the night.
5. this book ________________________ (条理不清),some parts are even contradictory.
参考答案：
1. lose contact with
2. keeping up with the rest of the class.
3. part of a long chain of customers and suppliers
4. i had to call the doctor
does not have an integrated structure