大卫,该睡觉了。A. It’s time to go to bed, David.B. Go to bed, David.C.Shall we go to bed, David?
--Can you make the bed ?--Sorry ,I________.
Is this ________ bedroom?
There ________a pencil and two pens in my pencils -case.
This is a picture ________my family.
Are there any ________in the mountain?