My first is an able modal verb my second is an auxiliary verb

Can-do -  исполнительный и энергичный

1.  people often throw wastes  in the river.  люди часто выбрасывают отходы в речку. 2.  for everything in life one has to pay.   за всё в жизни приходится платить.3.  the cost of the theatre tickets was $ 20.  стоимость билетов в театр была 20 долларов.  4.  my friend lends  money too often.  мой друг одалживает деньги слишком часто.5.  i always return back the money that borrow.  я всегда возвращаю деньги, которые занимаю.6.  to save money, you need to save energy.  чтобы сберечь деньги, нужно электроэнергию. 7.  yesterday i got    my first  earned  money.  вчера я получил  свои первые заработанные деньги. 

Life of a teenagerжизнь подросткаmany things have changed over the past decades. same can be said about the life of modern teenagers. today teens are more independent, have other interests, and are definitely lazier than before. computer is the root of most changes in the society. modern teenagers spend almost all their free time online, playing computer games, chatting with friends, surfing social networks, instead of going out and doing some outdoor activities. if you ask a teenager what the life was like twenty or thirty years ago, he won’t answer, because he doesn’t know. modern children simply can’t imagine their life without cell phones, tablets and mp3 players. these gadgets have gradually replaced the whole world of childish games and live communication. previous generations of teenagers could still be seen in the streets jumping, running around and playing active games. today, teenagers are mostly seen online. from the one hand, it’s certainly not good. from the other hand, this can be understood. how can children avoid electronic toys if they are everywhere? other than that, the life of teenagers is not easy. they have a number of problems, which they don’t want to discuss with adults. chatting with friends, at least they can share with them. being online, they can also find answers for many urgent questions or problems. modern teenagers are luckier than other generations for having the freedom of choice and life full of possibilities. it’s a “computer-based” generation. even their homework is done with the help of computers and the internet