－ Look! Mrs Green is wearing a black dress today.－ I think she _______ wear red. She looks young in red.

Susan’s parents bought a large house with a swimming pool. It ______be very expensive.

—Look! The boy in the white shirt ___be Tom. --It ____be him. I saw him enter the library just now. 

—Where did you meet him?—I met him on a number eleven bus, if you       know.

—Look at the picture on the wall. It ________be David’s.—Yes, his name is on the first page.