The scientist wrote down_____ series of things to do with______ nature, such as a blue sky.
A   a, /         B. a, the       C. /, /           D. /, the

In his first speech as victor, Obama said, “There are many who won’t agree with every decision or policy I make as ________ president, and we know that government can’t solve every problem. But I will always be honest with you about ________ challenges we face.”

The party was ____ success. We sang and danced until it came to ____ end at midnight.

It is ______ unusual feeling for animal lovers to see ______ giant panda, one of China’s most famous animals.

Susan, _______ university student from Europe, teaches me _________ art in her spare time.

When he left ________ college, he got a job as ________ reporter in a newspaper office.

Some people argue using ____________ nature to meet our own needs may spell disaster, unless we start to look around and understand how _________ clean environment benefits us all.

____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

Sending messages by telephone has become _______ second most popular way of exchanging of New Year greetings, according to _____ research by China Daily.

------- we are going there by _____ sea.
------ Don’t you think it too slow? Why not take ______train?