单项选择题
Tom is a very smart lad. If he ______ to work hard, he is going to be the top of the class.
单项选择题 Those are probably the ______ curtains in the store.
单项选择题 Mary: I went skiing. Jill: Mary said (that) she ______ skiing.
单项选择题 You ______ help me if you don't have time. I can do the job myself.
