--I think it is necessary for everybody to take action _______ the Earth.
--I agree. Turn off the lights before we leave the classroom.
| A．protect | B．protecting | C．protects | D．to protect |
Dad, where are we going isinteresting TV program. We all like it.
| A．an | B．a | C．the | D．/ |
Don’t trouble trouble ________trouble troubles you.
| A．until | B．when |
| C．while | D．if |
Justin Bieber is ________ singer that young people are crazy for him.
| A．so a popular | B．such popular a |
| C．such a popular | D．popular so a |
— I didn’t hear you come in just now.
— That’s good. We tried ________ any noise.
| A．not make | B．not to make |
| C．to make | D．making |
________ the plane was missing for several days, ________ people didn’t give up.
| A．Although; but | B．Although; / |
| C．Although; however | D．Although; and |