Parents buy mobile phones for their offsprings as they want to be informed about their current location and safety. In this case, I think that mobiles are rather useful. Furthermore,kids can download distracting games and play them at school,instead of actual learning.
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Первое - C
Второе - A
Третье - D
Четвёртое - B
1) By the time Graham arrived at the train station, the train had already left.
2) How long had you been trying to call Tom before he finally answered the phone.
3) The children had put away their toys before their mum came back home.
4) Alan had a headache because he had been playing computer games all afternoon.
5) Simon had been saving money for many years before he bought his own house.
6) The football game had just started when it began to rain.
<span>my wonderful weekend</span>