22. I _____ my university professor in the supermarket near my house, which was out of my expectation.
| A．came out | B．came across | C．came about | D．came along |
Doctors strongly recommended that my father more exercise regularly instead of sitting still before a computer all day long.
| A．takes | B．take | C．took | D．had taken |
The more one is _______ the English-speaking environment, the better he or she will learn the language.
| A．exposed to | B．filled in | C．caught on | D．kept up |
—I’m afraid I can’t finish the book within this week.
—Don’t worry. .
| A．Please go ahead | B．That’s right | C．Not at all | D．Take your time |
According to a UN report，one third of the world population have no to clean drinking water and health care.
| A．means | B．approach | C．channel | D．access |
Helen has got it takes to be a great tennis player. In other words, she has the potential to become world famous.
| A．how | B．what | C．when | D．that |