It is (不礼貌的) to push in before others while waiting for the bus.
Why didn't you come to open the door for me?
I (wash)dishes in the kitchen and didn't hear the doorbell.
I didn't know (teach)children when I started to work in a primary school.
(luck),he got better before the important competition.
We hope that more (China)will win honour for our country.
More action must be taken to stop (pollute).