3. Choose the correct answers. The light bulb
What would we do without electric lights? In the 1800s, light bulbs ' _by
different people, but none of them were good enough to sell until the right
material to go inside the bulb?
— Thomas Edison. Since then, electric lights
- around the world by billions of people.
The original designº— much, although more energy-efficient light bulbs
now in many parts of the world. However, in some countries, people can't
afford to use electricity. This fact encouraged U.S. teenager Ann Makosinski
to invent a new kind of light. This light ® __by electricity. It uses body heat
instead. But '_replaced by this new invention in the future? Probably not, but
light — and so this invention could definitely become popular in many parts
of the world.

1. a) are developed b) developed c) were developed d) is develop
2. a) were discovered by b) was discovered c) was discovered by d) were discovered
3. a) have used b) have been used c) have be used d) have use
4. a) isn't changed b) won't change c) hasn't been changed d) hasn't be changed
5. a) will be bought b) is bought c)are bought d) were bought
6. a) isn't powered b) wasn't powered c) hasn't powered
d) not powered
7. a) will be the light bulb b) will the light bulb be c) will the light bulb d) the light bulb
8. a) will be always needed b) always will be needed с) will be needed always d) will always be needed​

My college classes begin at half past eight in the morning and finish at ten past two in the aftermoon. I study 6 days a week. I usually have 3 classes, but sometimes there is an additional fourth class. After the second class there is a break that lasts 45 minutes. During the break I usually go to the canteen or the snack bar.

Most often during the week we see our Computer Science teacher, she teaches us the basics of programming and architecture of computer systems. It is one of my favourite subjects, as it will come in handy in my future profession.

My favourite day of the week is Saturday. On this day I relax, listen to music, play computer games, do sports, go for a walk with my friends. Sometimes we ride bikes, sometimes go to the park for rides or go to a cafe to drink juice or eat ice cream. On Saturdays, no one calls me home early or makes me do my homework because I do my homework on Sunday. And when I have enough willpower, I do lessons on Friday, and then I have two free days - Saturday and Sunday! But this doesn't happens often: on Friday evening I have a rest too.

Мой любимый день недели — суббо­та. В этот день я отдыхаю, слушаю музыку, играю в компьютерные игры, занимаюсь спортом, выхожу погулять с друзьями. Иногда мы катаемся на велосипедах, иногда ходим в парк на аттракционы или идём в кафе выпить сока или съесть мороженое. По субботам никто не зовёт меня домой порань­ше и не заставляет делать уроки, потому что я делаю домашние задания в воскресенье. А когда у меня хватает силы воли, я делаю уроки в пятницу, и тогда у меня два свобод­ных дня получается — суббота и воскресенье! Но такое случается редко: в пятницу вечером я уже отдыхаю.