---So hard_ in the past few months that he has made great progress in English.
---I can see that, only a few mistakes _____ in this exam.

---Did you go somewhere on holiday?
---I ____________ to go to Hawaii, but I didn’t sign up for the tour in time.

--- I hear Jane has gone to the Holy Island for her holiday.
--- Oh, how nice! Do you know when she ______ ?

--- It’s the office! So you ______ know smoking is not allowed here.
--- Oh, sorry.

18．In this experiment, they are woken up several times during the night, and asked to report what they _______.

15．－Tom, you've got an A in the final English exam. Congratulations!
－Thanks. But I never thought the result would come out so fast. The papers_____when I left the teacher's office just now.

—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there.
 —I really should have gone with you but I _____ on some remaining problems.

—Can I use the telephone on the table, sir?
   —Under no circumstances _________ to use the telephone in the office for personal affairs.

Miss Li _ as a secretary for five years in the company, and now she is general manager of it.
 

 
17．—Is there any better way to help my son get rid of the habit of playing computer games?
—To tell you the truth, it’s very hard. But we_______on this problem to improve the situation.