[多项选择]Obligations to our parents are very important.
2. Sometimes, obligations to parents cause people much distress.
3. We’d better find a way which can make ourselves happy while pleasing our parents at the same time.

[填空题]Parents play very important roles in the shaping of children’s characters.

[填空题]We inherit our DNA from our parents. DNA is shuffled, recombined and{{U}} (36) {{/U}}from one generation to another. Each individual on this earth received 23{{U}} (37) {{/U}}of chromosomes from their parents (23 from dad and 23 from mom). Because DNA is{{U}} (38) {{/U}}to a certain degree from one generation to the next, it is possible to{{U}} (39) {{/U}}family lines by{{U}} (40) {{/U}} specific markers. The{{U}} (41) {{/U}}of the Earth are more closely related than what it is generally thought. Today there are 6{{U}} (42) {{/U}}people living on this planet. If we do some math, and we consider a generation to be about 25 years, 30 generations ago, every individual living today would have over 1 billion{{U}} (43) {{/U}}ancestors. The estimated world population for the year 1250 AD was 400 million people. This means that the number of actual ancestors for each individual is smaller than the number of possible ancestors and{{U}} (44) {{/U}}.These common ancesto

[简答题]In the early stage of our life, our parents are the ones who shower us with unconditional love and care, they teach us about what is right and wrong, good and bad. But we always tend to take this for granted. It is only after marriage and having kids that a person understands and becomes sensitive to others’ feelings. Kids make a person responsible and mature and help us to understand life better.

[填空题]When she comes back, her parents would be very happy. ______, her parents are very happy.

[填空题]Tom’s parents are very (friend) ______ to his girlfriend.