——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?
Look out! Don’t get too close to the house ________ roof is under repair.
Do you remember the place ________ we visited last year?
I’ll never forget the day ________ we worked together
Only in this way ______ solve the problem.
He seldom has lunch at school, ________?