_____ does your mother often run with her dog? —About half an hour. [ ]

You are confident about the job interview, aren’t you? —- , I’m well prepared and feel I’ve got everything they need.

He is a good student. He _____his lessons.

Qinghai-Tibet Railway(青藏铁路) was completed last year. It is the __________ railway that connects Tibet with the other parts of China.

How was your last day off? ––_______. It was windy and cloudy all day.