_______from the moon, our earth, with water _____about 70 percent of its surface, appears like a blue ball.
| A．Seen; covered | B．Seeing; covering |
| C．Seen; covering | D．Seeing; covered |
the safety of gas, the government has checked the city’s gas supply system thoroughly.
| A．To ensure | B．Ensuring | C．Having ensured. | D．To have ensured |
—Did you see who the driver was?
—No, so quickly, that I couldn’t gat a good look at his face.
| A．did the car speed by | B．the car sped by | C．does the car speed by | D．the car speeds by |
By improving reading skills, you can read faster and understand more ofyou read．
| A．that | B．what | C．which | D．whether |
there is a snowstorm or some other bad weal. her, the mail always comes on time.
| A．Because | B．If | C．When | D．Unless |
The thought of going back home was kept him happy while he was working abroad．
| A．that | B．all that | C．all what | D．which |