17..In the United States, bus travel doesn't cost much as train travel, ?18.
-What made you so delighted at Christmas? -__________.
They no longer have to ______ large numbers of temporary workers to do the harvesting.
_________ many times, but he still couldn’t understand it.
It is to read the books our teacher recommended , for they are well _____ reading.
He was so __________ a key university that he would work until late into the night.