Follow the directions on the bottle carefully when _______.
| A．you will take the medicine | B．taking the medicine |
| C．to take the medicine | D．taken the medicine |
This young tree could not have been damaged ______accident; I believe it was done _____ purpose.
| A．by; on | B．for; with | C．by; with | D．for; on |
Their work other writers ever since.
| A．have influenced | B．has influenced | C．influenced | D．influences |
Barcelona is situated the northeast coast, about five hundred kilometers east of the Spanish capital, Madrid.
| A．off | B．in | C．on | D．to |
All the students ______come from America are here.
| A．who | B．which | C．/ | D．that |
You will succeed in the end ______you give up halfway.
| A．even if | B．as though | C．as long as | D．unless |