I don’t knowtodo it, so I want to ask the teacherfor advice.

It is important to remember that success ________ a sum of small efforts made each day and often ________ years of achieve.

The air in big cities _____very dirty by factories.

The whole world is undergoing the biggest financial crisis nowadays, ____ calls for international cooperation among all nations to get over

When I get puzzled about some difficult problems, myteacher always encourages me and says , “Take it _________ .”