It was at the gate of our school ____we gave the visitors a warm welcome.

It was global warming , rather than other causes , ______ led to the extreme weather .

 Where do you think ________ we can buy that best­seller?

—The patient looks much better.________ is it that has made him ________ he is today?—Perhaps the special medicine and his family's patient care.

 If you have a job, ________ yourself to it and finally you’ll succeed.