---How long will you stay here?
---I don’t know. ________.
| A．Never mind. | B．That’s OK. |
| C．It doesn’t matter. | D．It depends. |
．It is worth the time to talk to Professor Li in that he can always ____ some practical suggestions．
| A．get close to | B．keep up with | C．come up with | D．live up to |
．Parents’ opinions on studying abroad differ greatly _____their children’s ____their aims．
| A．in; from | B．from; in | C．from; about | D．in; on |
--- Mum, I don’t want to take the medicine．
--- Oh dear, you should know that good medicine for health ____ to the mouth．
| A．tastes bitter | B．tastes bitterly | C．is tasted bitter | D．is tasted bitterly |
--- You won’t go to Mary’s wedding, will you?
--- No, _____ invited．
| A．if | B．once | C．though | D．in case |
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 |