We’d better set off now, or it will be dark we know it[ ]

We will build a high-speed railway in Taizhou before 2015.—Wow, ________ exciting news!

Excuse me, sir. Here’s a letter for Liu Tao. Which room does he live in —–_____.

Well，the chief is not ready to make a decision yet.—So，________，we have to wait，right?

I ______ my mind to study harder since I visited the Shanghai Supercomputer Centre.