The coach usually does not only keep an eye on the development of each individual member but on that of the group .
Is thisthe research center _____you visited thelablast year ?
Don’t believe him .He is just _____ an excuse .
-Would you mind if I take the seat? - .
The bell rang and came in Mr.Brown, a book in his hand. Then the class began.
In the past 5 years a great deal of money _____ improving the environment of the school.