Is _______ Qinghai-Tibet Railway plays an important role in China’s railway history the topic that you’re coming to?
This problem may lead to more serious ones if ____ unsolved.
After the professor____out the project made a comment on the report, the media focused on it.
Written in a hurry, ____.How can it be satisfactory?
The Internet gives people the chance to have the information they look forward ____ to them quickly and cheaply.
The woman pulled her hat low down ____ her eyes in order not to be recognized by the angry crowds.