-Listen! Is Mary playing the piano in the room? --No. It ________ be Mary. She has gone to Hong Kong.
--Why are you taking a basket with you for shopping? --The stores doesn't_______ plastic bags for shoppers to protect the environment.
--What should I buy here? --If you have friends who smoke, Winston is a well-known ____ of cigarette here.
--I feel really _______ about the exam tomorrow, dad. --Never mind, dear. Believe in yourself.
The students are fed up with their studies because they are_______ to do far better than they can.
--Hi,! My name is Tim. It's my first time to be here. --__________.