21.A:“ What does your sister look ----- ”

21.A:“ What does your sister look _____ ”B:“ She’s got long black hair and green eyes.”22.A:“ In my opinion,the best pasta _____ made in Italy.”B:“ Yes,I agree.”23.A:“ Have you seen the magazine I was reading?”B:“Yes,it’s either on the desk _____ in the magazine rack.”24.A:“ I can’t understand this question.”B:“ Try again.It’s not as difficult _____ you think.”25.A:“ Are you worried about next week’s exam ”B:“ Well,I’m sure there _____ be some difficult questions in it.”26.A:“ Would you like a drink ”B:“ No,thanks.I gave _____ alcohol two months ago.”27.A:“ What are you going to do this weekend ”B:“ If it _____ snow,we’ll probably go for a walk.”28.A:“ Who discovered Australia ”B:“ It _____ discovered by Captain Cook in the 18th Century.”29.A:“ My cat,Cedric,is very fat.”B:“ Yes.If he _____ less chocolate,he would soon lose weight.”30.A:“ Has the committee _____ a decision yet ”A:“ Yes,we’re going to build the new conference centre.”