品句填词
You must ask for p ______ if you want to borrow his book.
His speech lasted two hours. He should s      it to one hour.
There was a b______ on the railway and all my trains were delayed.
We can follow up the river to discover its s________.
What________(百分率)of the babies die of this disease every year?
More information about our company is________(可以得到的)on the Internet.