Watch out ______ cars when you cross the road.

   A. at                                        B. to                                               C. of                             D. for

Watch out ______ cars when you cross the road.

   A. at                              B. to                                   C. of                            D. for

Watch out ______ cars when you cross the road.

　 A. at　　　　　　　　 B. to　　　　　　　 C. of　　　　　　 D. for