What is bothering Obama is how to improve medical care to benefit people. __________, how to create health care system that helps people is his present-day trouble.
The 13:30 train to Shanghai has been put off __________ the heavy storm.
They ___________to put their hearts into study..
When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housing price.
It was a _______story, and we all got ________.
--- Hey, Mary, your backpack looks nice. When did you buy it. --- I ____ it for two weeks.