His mother is ______. Today is his mother’s thirtiethbirthday.A. thirteen B. thirty C. Thirtieth
I don’t know the teacher ________ is talking with Miss Wang.
If I find his phone number,I ________ you.
People often go skating in ________ winter.
.—Has your father finished his report? —Sorry,I don’t know.He ________ it this morning.
—Could you please come to the museum with me this afternoon? —Sorry,I ________.I have to take a piano lesson at 2 pm.