Europeans always hold their fork in the left hand, ________Americans switch it between their left and right hands.
| A．before | B．because |
| C．while | D．since |
．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 |
It is likely that water is not ____ endless resource, nor ____ that can be made once more．
| A．the; / | B．an; one | C．an; that | D．/; one |