When the students were playing games on the playground, Jim suddenly stopped ______and began to cry, so we stopped _______ what was wrong with him.
一Is this your bike?—No.It is ______, _______ is red.
They don’t have _______ color pencils,but I have _______.
Can you see a set of keys here?
Where is _____ eraser? _______ eraser is on Jack’s desk.
There is ______ “u” and _____ “l” in the word “ruler”.