_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable.
The Chinese are looking forward to the first ______ to land on the moon after launching the first lunar exploration satellite,Chang'e1,successfully.
Sometimes we fail and sometimes we succeed.It is how you react that makes a______ in life.
There are twentyeight classes in our school,______ over 56 students.
A number of new machines were introduced from abroad,______ an increase in production.
Grades would______from one or two,for outstanding or excellent,to six or seven,for poor or very poor.