The scientists are beating their brains, trying to ______ a solution to the problem.

What do you think about the idea?—I am really against _________ a running race in thestreet.

OnSundays there were a lot of children playing in the park, ____parents seated together joking.

ine, ____ the alarm clock for 6 o’clock,or you would oversleep and be late for the train

With so much homework to do，David told his sister_____so much noise.