--____will you come back?
----In an hour.
| A．How long | B．How often | C．How | D．How soon |
There is a picture _____ a bike.
A.in B. of C. at
In the USA, people on bikes must ____ a helmet.
A. on B. put on C. wear
There are always three lights: red, yellow and ______.
A. green B. blue C. orange
How do you get to the USA ________ China?
A. for B. to C. from
How can I ______ the zoo?
A. gets to B. to get to C. get to