D. Complete the sentences with must not or cannot. 1.How can you say such a thing? You __ be serious. 2.Ben is a good friend of Shine, but he hasn’t come during her birthday. He ____have known the address. 3.Their car is not on the garage. They ____be home yet. 4.You haven’t started your assignment. You____ answered everything in just 10 minutes. 5.I just bought cereals this morning. The jar ____be empty just now.​