As students, we ________ study hard to make our country more beautiful and stronger.

You ______ wear sports shoes when you climb a mountain.

He asked_____ those shoes were.I told him they cost 120 yuan. [ ]

_______ have you been studying English? —For about 15 years. [ ]

Kim, I haven’t seen your mother for so long, where is she? —Oh, she ________________ England to learn further studies(深造). She left a month ago.