It is very kind _____ you to help me with my lessons. It is difficult _____me to learn them well.
— 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.
--- Did your mother go shopping last Monday? ---Yes, she__________. A. does B. was C. did D were