The mistakes made by Chinese students are quite different from _________ made by the Japanese students in English study.
It could take 4-6 months before the first batch(批)of vaccines (疫苗)are available to fight A/H1N1 flu ________ as swine flu, WHO officials said.
Young people tend to get up very late unless ________ to rise early.
No reader ________ take away a book from the library without the permission of the librarian.
. --Did you see ________ may be the longest total solar eclipse (日全食)in 500 years yesterday?--No, it was cloudy above my city at that time.
________ a two-year period, Nancy became addicted to painkillers (止疼药).