Chọn đáp án đúng

There are for (1)......................in a year. They are: spring, summer, fall and winter. (2).......................spring, the weather is usually warm. There are many flowers in (3).......................After spring comes  summer. In summer, the days (4)...................long and the nights are short. We often go to the seaside in summer. Fall is the season of fruits. We can (5)........................different kinds of fruits, especially in tropical countries like Viet Nam. In winter, it's usually very (6) ......................The days are short and the nights are long.
                           1.a.seasons                    b.reasons                        c.countries
                           2.a.On                             b.At                                 c.In
                           3.a.fall                             b.winter                           c.spring
                           4.a.is                               b.are                               c.have
                           5.a.to enjoy                     b.enjoy                            c.enjoying
                           6.a.cold                           b.cool                              c.warm