The old scientist has made a great contribution the moon.
| A．in explore | B．to explore | C．explore | D．to exploring |
Dick often helps him ______ his math.
| A．at | B．with | C．of | D．/ |
On weekends, we likeTV at home.
| A．watching | B．watched | C．watches | D．watch |
6:45读作.
| A．a quarter to six | B．a quarter past six |
| C．a quarter to seven | D．six past a quarter |
-Tina ,are you going to playchess on Sunday?
-Yes, and I'll also playviolin that day.
| A．the, the | B．the,/ |
| C．/,the | D．/,/ |
When do you get ______ Hong Kong?
| A．to | B．up | C．with | D．in |