_____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.

— Are you in favour of Tom’s suggestion________we work around the clock to meet the deadline?— No. But ______ Jimmy suggested to me sounds practical.

That art centre is______used to be a factory,________millions of cars were made in.

The boys are still playing basketball happily on the court ______ it is raining heavily.

There is much ______ can be done about the accidents ______ from carelessness.