Last night I was watching some news about the American financial crises(金融危机) on TV _______ the power went off.
| A．while | B．as | C．when | D．during |
________our earth，or else it will be no longer fit for us to live on.
| A．Protecte | B．To protect | C．Protecting | D．Protect |
—Look！He’s running so fast!
—Hard to________his legs were once broken.
| A．know | B．imagine | C．realize | D．find |
—I saw no more than one motor car in that shop.Will you go and buy________？
—No，I’d rather buy________ in other shops.
| A．one；one | B．it；one | C．one；it | D．it；it |
Leave your key with a neighbor ________ you lock yourself out one day.
| A．ever since | B．even if | C．soon after | D．in case |
Forests ________ and burned at such a speed that they will disappear from the earth in the future.
| A．cut | B．are cut | C．are being cut | D．had been cut |