2.   A)insects                B)birds                         C)fish                    D)snakes 
3.   A) effect       ;         B) affect                        C)effected            D) affected 
4.   A) because             B)for the reason that     C) because of        D)since 
5.   A)months               B)days                           C)minutes            D)weeks 
6.   A)flight                   B)fly                              C)movement       D)transportation 
7.   A)prevented from   B)ordered by                 C)helped by         D)intruded on 
8.   A)and                      B)but                              C)therefore         D)however 
9.   A)portions               B)parts                           C)sections          D)kinds 
10.  A)try                      B)tries                            C)seem               D)seems 
11.  A)things                B)parts                           C)cells                 D)actions 
12.  A)awaken              B)wake                          C)awakening         D)wake-up 
13.  A)how                    B)why                           C)where               D)what