The traffic rules say children under the age of four and ______ less than 40 pounds must be in a child safety seat.
--Did he notice you enter the room?--I don’t think so. He ________ to the radio with his eyes shut.
It is ten years since we ________ each other. We have been working together.
I asked my English teacher and he replied with a ________look.
The plane takes off at 6:00 p.m. So I have to arrive at the airport ________ 5:30 p.m. at the latest.A after B. since C. until D. by
--How long ________ as an assistant here?-- Ever since I finished middle school.