He would have come here on time, but he _____ in the heavy traffic on the way.

Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

This is ________ one-eyed sick animal that needs ________ X-ray.

Paul has lost her iphone 5.—No, it ___be in her bag. I _______ hear it.

Look out when crossing the road, _____ you may be hit by a car.