( )| A．In the USA, people on bikes must put on a jacket. |
| B．In the USA, people on bikes must wear a helmet. |
( )| A．by ship | B．by bus |
( )| A．We must pay attention on the traffic lights. |
| B．We must pay attention to the traffic lights. |
( )| A．by bus | B．by train |
( )| A．Wow, so many bikes here! |
| B．Wow, so many pictures here! |
( )| A．Don’t touch the door. |
| B．Don’t stop. |
( )| A．go to school | B．get to the park |
B. 
C. 
D. 
E 
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