Who is that man sitting there______—-Well, if you must know, his name is Jack.

Nowadays it’s very useful ______ a foreign language.

My dream is to build university on the moon some day.— It sounds like unusual dream. I wish you could realize it.

Mike is from America. He ________ English.

(2013·新课标Ⅱ)Only by increasing the number of doctors by 50 percent ________ properly in this hospital.