If people keep polluting the rivers, no fish there will survive ___.
So far only four of the 77 Chinese children who went missing from a home in Britain last month ________, according to The Guardian.
. Busy as he is, he ________ a few hours a week for physical exercise.
He was once turned down by a primary school for lack of ________ practical teaching experience. But now he has turned out to be one of ________ best teachers in the city.
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.