There are over 58,000 rocky objects in ______space, about 900 of which could fall down onto______ earth.
| A．the ; the | B．the ; / | C．/ ; the | D．a ; the |
. Deserts, dry areas with _____ no vegetation, cover more than one-third of the Earth's land surface.
| A．surprisingly | B．eventually | C．permanently | D．virtually |
All too _____ it was time to go back to school after the glorious summer holidays.
| A．often | B．fast | C．soon | D．late |
The rainbow _____ as the sun came fully out from behind the clouds.
| A．dissolved | B．removed | C．resigned | D．disappeared |
The car salesman took the customer for a driver in the new model in order to _____ its improved features.
| A．advocate | B．demonstrate | C．exhibit | D．reveal |
Can you _____ me _____ two hundred copies of this article by tomorrow.
| A．give .. out | B．send .. in | C．write .. off | D．run .. off |