Mary hasn’t written to us for a long time.—What do you suppose __ to her?

He can write well.——He_____, but he doesn’t. He’s too lazy.

This special school accepts alldisabled students, ________ educational level and background[ ]

days after the aircraft went missing, an international effort ________ ships and planes hasn’t found any wreckage, ________ growing frustration for the families of the 239 people on board.

About _____ of the workers in the factory were born in the .