I can’t find the recorder in the room. It ________ by someone.

Listen! Someone is singing in the next room. Who ____ it be Is it Li Wei—No, it ______ be her. She is at school now.

The workers are all tired, but ________ of them stopped ________ a rest.

I used to go camping a lot, so it wasn’t the first time I ______ in a tent.

My mum often me do my lessons after school.