3．There was plenty of time.She needn't_have_hurried (hurry)．

　　4．I have no bike, so I have_to_go (go) to the office on foot.

　　5．You needn't_buy (not buy) a gift, but you can if you want to.

　　6．Look！The road is wet.It must_have_rained (rain) last night.

　　7．Bob ought_not_to_speak (not speak) to his mother like that.

　　8．You must_come (come) here on time, or you'll be fined next time.

　　9．Hurry up！We ought_to/should_go (go) to school right away.

　　10．Her eyes are red.She must_have_been (be) crying.

　　Ⅱ.单句写作

　　1．(2017·江苏高考书面表达)Therefore, the film industry should_make_greater_efforts (应该做出更大的努力) to attract more viewers.

　　2．(2016·全国卷Ⅲ书面表达)I have just found that I_have_to_attend_an_important_class_

meeting (我必须参加一个重要的班会) that afternoon.

　　3．(2015·全国卷Ⅰ满分作文)The length of the article should_be_limited_to_400_words_

or_so (应当限制在400词左右)．

　　4．(2015·四川高考满分作文)I badly need_someone_to_help_me_with_my_oral_English (需要有人来帮助我学英语口语), at which lots of Chinese students are bad.

　　5．Mr.Smith can't_have_gone_to_Beijing (不可能去北京了), for I saw him in the library just now.

　　6．You oughtn't_to/shouldn't_have_written (本不应该写) so fast.

　　7．You needn't_have_referred_to_it (本不必提起它), for I had known about it.

　　8．You must_have_seen (肯定看过) the film Wolf Warrior Ⅱ.

　　Ⅲ.语法填空(用适当的情态动词填空)

　　The bell for class just rang for the second time, but Tom didn't turn up.He 1.should/ought_to have arrived at school earlier because there would be a math test for the whole class today.He is one of the top students in the class.He usually comes to school on time."He 2.should be in class now，" thought his master teacher Mrs.Green."I 3.must make sure what has happened to him."

　　So she went out of the classroom and rang up Tom.

　　"Hi, Tom! You 4.ought_to be at school now.Where are you？"

　　"Good morning, Mrs.Green.I'm still at home."

　　"Why? Why don't you come to school today？"

　　"My mother is ill, so I 5.have_to/must look after her at home."

　　"Your father should be at home, so you 6.needn't/don't_have_to stay at home to take care of her."

"But my father hasn't got back from work yet.I will go to school as soon as my father gets