Though it was late , _____ he went on with his work .
--Take good care of yourself, son!--Don't worry, mom! I will call you as soon as I ________ America.
--Do you still remember the days ________ we spent in the country?--Yes, of course, they were peaceful and relaxing.
Hurry up! The movie _______ for ten minutes!
--How do you like the twins?--Well, I think the elder sister is _______ but the young sister is _______.
--- There were so many books in the shopping center, I didn't know_______ .