1. Drinking milk every day is good for our h_____. 2. A lot of v_____ make us keep in good health. 3. On Valentine's Day (情人节) boys often send c_____ to their girlfriends. 4. J_____ food is not good for one's health. 5. —What do you think is the most difficult s_____? —I think it's math. 6. My healthy lifestyle helps me get good g_____. 7. There are a lot of animals in the z_____.