The police at Denver International Airport examined a bomb threat against a United Airlines flight to San Francisco,____________ the flight for hours.

We’ve been told the good news, but when and where to go for the exciting paid vacation _______ yet.

—I didn’t take notes at yesterday’s meeting because I had left my pen at home.

—You ________ mine. I ______ it.

Nowadays, many people walk to work ________ Copenhagen Conference calling for living a low-carbon lifestyle to deal with global warming.

—What do you think about the new teacher?

—________ the new teacher is an elegant lady, she can be extremely difficult to work with.

---What’s wrong with him?

----The picture he came across___his memory of a sad story in his childhood.

He said that not until the heavy snow blocked the express _________ how serious the weather was.

You should be       .You mustn't take any unnecessary risks until you are quite sure.  

—Are you firmly against any independence move by Taiwan?

—Of course. That’s ________ our basic interest lies.

— What a shame ! It turned out to be a failure.

— We missed a process,_______ we could not succeed in the experiment.