1) challenge a) buying and selling of goods / services by computer
2) handbills b) activities done in order to increase the sales of a product
3) research c) a new or difficult task that tests somebody’s ability and skills
4) convince d) to make somebody believe that something is true
5) attempts e) to supply what or needed
6) transmissions f) a means of making use of something
7) access g) a process of passing something from one place, person to another
8) to provide h) a small printed advertisement that is given to people by hand
9) e-commerce i) a careful study of a subject of a subject to discover new facts
10) promotion j) to make an effort to accomplish something

I go to school every day. I don't go to school every day. Do you go to school every day? How often do you go to school?

I'm doing homework in my room now. I'm not doing homework in my room now. Are you doing homework in your room now? Where are you doing your homework now?

I have passed my English exam this week. I haven't passed my English exam this week. Have you passed your English exam this week? What exam have you passed this week?

I have been working in my garden for 2 hours. I haven't been working in my garden for 2 hours. Have you been working in your garden for 2 hours? How long have you been working in your garden?

Объяснение:

Present Perfect:

I have done my homework already.

He hasn't done his homework yet.

I have never met such a nice person.

Present Simple:

I go to school every morning.

We usualy have tea after breakfast.

She works as a shop assistant.

Present Continuous:

I am listening to music now.

We are watching TV right now.

Peter is playing football now.

Past Simple:

I saw him yesterday.

They painted the house two years ago.

Nick visited his grandmother last week.

Past Continuous:

I was playing tennis when he called me.

She was writing a letter yesterday at 5 o'clock.

We were cooking dinner when he came

Объяснение: