Some of the students have already learned enough English to ____ a conversation with a native English speaker.
The more one is ______ the English-speaking environment, the better he or she will learn the language.
It is requested that the reporter _______ to blame for the wrong report.
It’s such a good place ______ everyone wants to go and visit _______ it is well-known all over the world.
A direct air route _______ Chongqing and San Francisco is expected to open next month.
He will have learned English for eight years by the time he _______ from the university next year.