I don't understand how you got a ticket．I always ________ you ________a careful driver.
| A．think…are | B．am thinking…are | C．thought…were | D．think…were |
Maybe you have been to many countries, but nowhere else _______ a more beautiful palace.
| A．can you find | B．you could find | C．you can find | D．could you find |
This problem may lead to more serious ones if_______ unsolved.
| A．making | B．left | C．remained | D．keeping |
________, you need to give all you have and try your best.
| A．Being a winner | B．To be a winner |
| C．Be a winner | D．Having been a winner |
Many human activities also _______carbon gases, which will result in global warming.
| A．put off | B．send off | C．let off | D．set off |
Take good care of the resources or they will be ______ soon.
| A．run out | B．used up | C．run away | D．using up |