Look around when _____ the street.

　　A. across　B. crossing   C. crossed　D. to be crossing

Look around ________ you cross the road. Safety is first.

1. A.
   as soon as
2. B.
   after
3. C.
   before
4. D.
   then

Look around when ______ the street.

1. A.
   cross
2. B.
   crossing
3. C.
   to cross
4. D.
   crossed

Look around when _____ the street.

1. A.
   across
2. B.
   crossing
3. C.
   crossed
4. D.
   to be crossing

Look around when ___________ the street.

　 A. across　　　　 B. crossing　　　　 C. crossed　　　 D. to be crossing