Ben _______ his keys everywhere，but he didn't find them．

A．looked for          B．looked at        C．looked after           D．looked up

The doctor ________ the child carefully and found that there was nothing serious with him.

[　　]

I have         all my newspapers, but I can’t find the article．

A．looked at              B．looked after          C．looked for              D．looked through

He ________ and said,“Where is my basket?”

[　　]

A．looks at

B．looks after

C．looked for

D．looked around