Глагол из скобок употребить в Present Simple или в Present Continuous.

1.a)how much does the box weigh?
b)they are weighing it at the moment.
2.a)Sally is looking for a bigger flat.
b) it looks as if her sister is coming to stay with her
3.a) why is he so noisy today?
b)he is usually very calm and well-behaved.
4.a)the singer isn’t appearing tonight.
b) he appears to have a bad cold.