He is so addicted to smoking that ______ seems to be no chance of talking him into quitting.

We can use QQ to talk with each other on the Internet.—Really? Will you please show me it?

Though he got up early, ______ he missed the train.

It’s necessary _____ us _____blind people cross the street.[ ]

Do you want______ bread?—Yes, I usually eat a lot when I’m hungry.