1. I've known my best friend _for 15 years.
a) for
b) since
2. __since ___ last Christmas, I haven't eaten any chocolate.
a)for
b)since
3. He's been sick __since ___ the last week.
a)for
b)since
4. Bob's worked there __since___ 1984.
a) for
b) since
5. I've been telling you to hurry up __for___ the last 30 minutes!
a)for
b)since
6. My mother has been trying to call me __since___ last week.
a) for
b) since
7. They have been colleagues __for ___ a long time.
a)for
b)since
8. He has been studying Russian ___for __ a few months.
a) for
b)since
9. I haven't seen her __since ___ last year.
a)for
b) since
10. I've been angry at him __since___ a couple of weeks ago.
a) for
b)since
Объяснение:
In most areas of his life, a person cannot do without a computer. This situation is due to its capabilities. Storage and exchange of information, communication between people, numerous computing programs - all this makes it irreplaceable for a modern person. However, using a computer has both positive and negative aspects.
Pros of the computer:
if possible connecting to the Internet, a computer is becoming an irreplaceable source of information: encyclopedias, dictionaries, reference books are available to the user at any time of the day;
also, with the ability to connect to the Internet, a computer is a means of communication for people living in different countries; this is possible by registering an e-mail box, registering on social networks, on Skype, etc;
the amount of computer memory allows you to load various programs used in offices, factories and production;
the computer is a versatile entertainment medium: disc games, online games, audio players and video players.
Cons of a computer:
negative impact on the child's psyche through free access to prohibited sites and programs, as a result of which the child may become dependent on the computer and aggressive;
every computer user needs training, which not everyone can do, however, given the fact that programs are becoming more and more advanced, this problem will soon cease to matter;
additional costs for electricity, maintenance and repairs, which are often very expensive.
I would like to point out that the disadvantages of using a computer depend on the person. This means that only in the hands of a person is it possible to use this useful technique exclusively in their own interests.
