Rising evidence suggests that the use of the vaccines(疫苗)will be effective to the spread of common cold.
The engineer buries himself in work all day long and has no time for some outdoor activities, __________ he has the interest.
Can you write about a challenging situation ______ you once faced in your life and how you dealt with it?
I’m always ________ about what I say because careless remarks are likely to hurt others’ feelings.
Evidence has been found through years of study __________ children’s early sleeping problems are likely to continue when they grow up.
Two lawyers have donated $ 50, 000 to _________ our school’s campaign “Help the Needy”, which was started by our former headmaster 10 years ago.