Water is very dangerous sometimes. So we must be careful _____ it.
| A．of | B．with | C．to | D．in |
A ________ girl named Dong Xinyi looked after her disabled father．
A．three-year-old
B．three-years-old
C．three years old
It is interesting for us ________ this game．
| A．play |
| B．plays |
| C．to play |
| D．playing |
Sun Yang ________ every day and he swims very well．
| A．exercise |
| B．exercises |
| C．do exercise |
| D．does exercises |
—________ is it from your city to my city？
—I am not sure．Maybe 200 kilometers．
| A．How long |
| B．How far |
| C．How many |
| D．How much |
It takes me half an hour ________ the piano every day．
A．play
B．playing
C．to play