at last,Tim thought up a good idea to solve the problem(同义句)
at last,Tim __ __ __a good idea to solve the problem.
this volunteer work takes Fred several hours a week.
Fred ___ several hours a week ___ this volunteer work.
Miss Hill has run out of her money.
Miss Hill's money ___ ___ ___.
she treied to make her mother feel happy.
she treied to ___ ___ her mother.