3. поставьте глаголы в скобках в present perfect negative. 1. i_(not clean) my football boots. 2.i_(not do) my homework. 3.my brother and i_(not buy) any sweets this week. 4.it's my birthday party tobay. i _(not invite) many people. 5.he_(not wash) his hands. they're very dirty. 6.where's alison? we_(not see) her since yesterday. 7.dad_(not take) a holiday since last august. 8.john_(not play) the violin since he was school. !

1)  haven't cleaned
2) haven't done
3) haven't bought
4) haven't invited
5) hasn't washed
6) haven't seen
7) hasn't taken
8) hasn't played

1. Haven’t cleaned
2. Haven’t done
3. Haven’t bought
4. Haven’t invited
5. Hasn’t washed
6. Haven’t seen
7. Hasn’t taken
8. Hasn’t played

Must teens help their parents to bring up their sisters or brothers?

On the one hand they must because they must help their parents.

But on the other hand may be teen didn't want another child in their family, but it was born. So why he or she must be responsible about this child in the future?

As for me, I think teens must help their parents and more than that when you grow up who will be the most close person to you? Only your brother or sister who you have treated like you like? Have you ever thought about it?

Laska a very small animal. The smallest member of the family Mustelidae. It features a thin and elongated body. Short legs are armed with sharp claws. The neck is long and strong. On a small blunt muzzle slightly forked nose, large dark eyes. Near the tail are glands secreting a substance with an unpleasant odor, which marks the animal area and discourages the enemy. It weighs no more than a weasel 200 grams.It can also eat lizards, snails, snakes and insects.   Ласка очень маленький зверек. Самый мелкий представитель семейства куньих. Отличается тонким и вытянутым телом. Короткие лапки вооружены острыми коготками. Шея длинная и мощная. На маленькой притупленной мордочке слегка раздвоенный нос, большие темные глаза. Возле хвоста находятся железы, выделяющие вещество с неприятным запахом, которым животное метит территорию и отпугивает врага. Весит ласка не более 200 грамм.Может питаться также ящерицами, улитками, змеями, насекомыми.