_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ball
| A．Seen; covered | B．Seeing; covering |
| C．Seen; covering | D．Seeing; covered |
.Mary is one of the girls who ______ always on time.
| A．is | B．am | C．are | D．Was |
.Tom is the only one of the stall members who ______ to be promoted.
| A．is going | B．are going | C．has been going | D．have been going |
.What caused the accident ______ on the road.
| A．were stone | B．were stones | C．was stone | D．was stones |
.Wisky and soda ______ his favorite drink.
| A．is | B．are | C．were | D．have been |
. ______ is to attend our evening.
| A．both the singer and the dancer | B．Either the singer or dancers |
| C．The singer or dancers | D．The singer and dancer |