Last Saturday, we were walking along the street _____ a car suddenly knocked an old man over.A when B while C as D since
I’d love to come to your beautiful house. If you invite me, I _______ say “no”.
My mother asked me if ______________ a picnic the next week in our school.
The traveling magazine________ me $ 20 .
The timetable(时刻表) tells us __________________________every day.
You’d better work in your hometown and then you can ________ your old father.