According to the recent regulation, it is required that any chemical plant that_______ along the river _______ to build a recycling center for the waste.

Since then, finding ways to grow more peanuts ______ his life goal.

 — Each of the students, working hard at their lessons, ______the book.  — So have I.

--_____ of the population of the city _____workers? --About 60 percent. 

(2013·高考江苏卷)Generally，students’ inner motivation with high expectations from others________essential to their development.