怎样用适当的冠词｛a,an,the｝填空,不需要冠词处写、
1.That's[]bike.
2.This[]eraser.
3.Is it []english book?
4.David isn't at []home.
5.I can see[]"U'and []"R'on the wall.
6.I have[] watch [] watch is old.
7.Do you know []boy in blue?
8.-Who's[]girl?
-She is [] linda.