The little boy was taken into the small house________ door faced the south
A that B. which C. whose D. its
One way to ______ species under threat of extinction is to remove them to zoos and parks and feed them there.
| A．reserve | B．prevent | C．preserve | D．reduce |
According to the statistics, listening to loud music at rock concerts ______ hearing loss in some teenagers in the past 2 decades.
| A．have caused | B．caused | C．had caused | D．has caused |
__________ her son for half a month, Marcia decided to leave for Texas with the hope of finding him.
| A．Not heard from | B．Having not heard from |
| C．Not to hear from | D．Not having heard from |
Mrs. Obama introduced the Let’s Move _______ yesterday. Its goal is to reduce children obesity(肥胖) today and in the future.
| A．challenge | B．battle | C．campaign | D．behavior |
—I think the whole class is going on a field trip next Friday.
—I’m not sure. ____________ has paid the transportation fee.
| A．Not everyone | B．No one | C．None of them | D．Neither of us |