根据短文内容，从方框中选择恰当的单词填空，有的需要变换形式。serious, saying, both, should, laugh, hard-working, though, earlyBill was a middle school student. He was lazy and not (1) _________, so he was always late for school and never got good grades. His father Paul didn’t know how to help him.Paul thought of his sister Linda. He said to himself, “I (2) _________ ask Linda for help. She is a great teacher in Green School. Maybe she can help Bill change his bad habits.” Then Paul called Linda and had a(n) (3) _________ talk with Linda. Linda promised (答应) to help, (4) _________ she was very busy.Paul took Bill to Linda’s home and asked him to stay there for a month. When Paul saw Bill a month later, he got a surprise. Bill got up much (5) _________ and studied a lot harder than before. Paul asked Linda what the secret (秘诀) was. Linda (6) _________ and answered, “As a(n) (7) _________ goes, ‘Actions speak louder than words’. During these days, (8) _________ of us got up early and I studied with him together. Then he ...”