The boys followed the marks that they ________, until finally they found their way back to the campsite.
| A．left | B．have left | C．had left | D．have been left |
I have no doubt _____ __he can do the job well though he doesn’t like it.
| A．if | B．whether | C．/ | D．that |
---Hey, Mr. Smith, you are wanted on ___ phone.
-----Who is calling?
----- ___ Mr. Green. I do not know who he is.
| A．不填; A | B．the; 不填 | C．the; A | D．不填; 不填 |
Is this the factory ______ my father visited last year.
| A．what | B．the one | C．where | D．that |
They are ______ at the _______ news.
| A．frightening, frighten | B．frightened, frightening |
| C．frightening, frightening | D．frightened, frightened |
Only by working hard , _______ .
| A．can succeed | B．succeed | C．can you succeed | D．you can succeed |