China is famous _____ the Great Wall.

It’s kind _________ you to help me with my English. You know， It’s impossible _______ me to pass this exam without your help.

Mark wears a T-shirt and looks ______ cool.

Only by increasing the number of doctors by 50 percent ________ properly in this hospital. (2013·大纲全国，32)

Could you teach me how to use the computer —___________.