13.Jane has already taken to school.
14.marks have given us before the bell rang.
15.they were called before you entered.
16.fruits will be bought next week.
17.my granny is being visited at the moment.
18.diary products were bought while he was looking for us.
19.delicious pies have been cooked.
20.i was being interrupt several times.
21.his monthly report has been already worked out.
22.her puppy is being taught now.
23.he was told how to keep everything under control.
24.her paper has been handed already.
25.i was being advised to take up judging.
1.Some people simply tear the wrapping off sweets and throw it away, don't they ?
2. Do they drop their cigarette packets and cans of drink without a thought?
3. How does their litter look like in the town ?
4. Does someone clear the litter away ?
5. Who picks the litter up in the country side ?
6. Can it kill or hurt farm animals?
х - время, которое плыла лодка по течению реки
10+2=12 (км/ч) - скорость лодки по течению
10-2=8 (км/ч) - скорость лодки против течения
12*х=8*(5-х)
12х=40-8х
12х+8х=40
20х=40
х=40:20
х=2 (ч)
Ответ: 2 часа лодка плыла по течению реки
8) washing
9) to look
10) stealing
13) answering
14) play
Вот и вся премудрость)