B. Complete the sentences using the Present Perfect or the Present Perfect Continuous.
1
Mary ……………………………………………………………...on a phone for two hours now!(talk)
2
Justin ………………………………………………………………an email. (write)
3
I …………………………………………………………………….her for five years. (know)
4
They ………………………………………………………………..all day. (study)
5
We ……………….just ….………………….our room. (clean)
6
Tom ……………..never………………..………..to Paris. (be)

Объяснение:

1. Mary has been telling on a phone for two hours now.

2. Здесь я сомневаюсь.

Justin has written an email.

Или

Justin has been writting an email.

3. I have known her for five years .

4. They have been studying all day

5. We have just cleaned our room

6. Tom has never been to Paris.

1) i will ride my bike tomorrow 2) my grandma got two letters yesterday 3)they were in the country last summer

mobile phones ,keeping fit

mobile phones entered our life not long ago, but today we can’t imagine our life without them. some doctors say that they are very harmful to the health, especially to the health of children.

the mobile phones emit electromagnetic radiation, and a number of different scientific institutes claim that this radiation is really very harmful, though still there is no hard evidence that showed that mobile phones caused harm in real humans. i try to talk over my mobile phone as less as possibleto avoid the health risks.