Rick often does ____ homework at 6:00.
_ We’ve waited ______ the bus stop for half an hour. _ No hurry. The bus will arrive ______ three o’clock..
A lot of trees and flowers are on ______ of the river and the number of them is growing ______.
Old people must __________.
_Who is _____ English teacher, Lu Yu? _ Mr Tian teaches _______ English.
_ What ______ useful book! _ Is it _____ one that you borrowed from Mr Green yesterday?.