1. It is important (necessary, urgent, difficult, easy, convenient, comfortable, expensive, desirable, advisable) for sb. to do sth.

　　翻译下列4句：

　　1) It is inevitable that the natural resources throughout the world are diminishing as the demand for them 在不断增长.不可避免的是，

　　2) It is obvious that the strength of a country’s economy 直接相关the efficiency of its industry and agriculture.显然，

　　3) It is urgent for the government to take measures to control the birth rate in our country/ to 把沙漠变为良田.政府迫在眉睫的是

　　4) It is necessary for us to build more hospitals, shopping centers, recreation centers, cinemas, and other public facilities to 满足the increasing needs of the people.我们必须建立

　　2. have trouble/ difficulty/ a hard time/ a difficult time (in) doing sth (有困难做某事)他很难找到一份满意的工作。 He has trouble finding a satisfactory job.

　　have trouble with sth. (对...有困难,不好对付) I have some trouble with my English study.