The store had no more red shoes _____, so Mary chose brown ones instead.
With all the novels he was interested in _______, he left the library and went back to his dorm.
--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job? ---____ my students have a try?
A series of stimulus policies and supportive measures taken by the government _____ to promote change in the economic environment in this area.
---Where did you come across our chemistry teacher ? --- It was in the supermarket ______I purchased mooncakes.
________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.