Only in this way ____to make an improvement in the operating system.

29．It is required in a recent study suggesting the importance ofteenagers’ communication with other children of the same age.

Do you know thefirst prize in the last Art Festival —By practicing every day.

Tom put his heart into the wildlife research, and finally, his efforts ________ him great success and fame.[ ]

That company _____________ us ￥30, 000 in 2013 to help the children in need.