—Were you at home at 9:00 last night? I called you but nobody answered. —Sorry, I ________ at that time.
—What’s the weather like in Qinghai in winter? —There is ________snow and it is ______cold.
— Excuse me. Where is the stair? — Ok. Go straight ____that door under the EXIT sign.
---Are there any animals in the zoo? ---____________.
__________ did your mother go? ---She went to Hangzhou.
Susan and her classmates__________ to the mountain last week.