By the year 2015, all of China's museums will be free to enter. We_______visit anymuseum without paying.A. can b. need C. must D. should
_____ is important _____ us to do morning exercises every day.
----What’s wrong with you, Eric? You look so tired. ----I ______ to prepare for the final exam last night.
----I can’t find my dictionary. ----_______ you put it in that bag.
----_______ does Tom go to the club? ----Once a week.
Most students exercise __________ a week.