—Have you ever been to Shanghai? —Yes,I________there a few months ago. A.have been B.went C.have gone
Today I am going to treat my good friends________ dinner.
The poor man , ________,ran out of the dark cave.
With everything needed______, she declared that the party began.
In order to ______ a good knowledge of English, he gave up his job and went to study in an English training center.
_____by a greater demand for vegetables, farmers have built more green houses.