––Has Mr Li known the news?––I’m afraid not. I called his house this morning but ____ answered.
While I _____________, someone ___________at the door.
They ____________ in the river when it __________ to rain.
Please knock at the door ________ you come into the room.
– Where is Jenny now? -- She _____________ in the garden.
– Daming, where are you going? -- Don’t worry, mum. I _______________ in ten minutes.