Почему в настоящее время люди испытывают недостаток в воде?

ПОМОГИТЕ С ТЕСТОМ ПЖЛ

1.                They arrived ___ Spain about two hours ago

At

In

To

From

2.                I really hate walking___

On feet

On foot

By foot

At foot

By feet

3.                His wife was not feeling too well and she wanted to ago ____ home

To

For

__

Into in

4.                She entered _____ the room quickly and stood near the door

In

To

____

Into

In

5.                She was born ___1985

In

During

At

White

1.    Two weeks ….. since I started my letter to you

Had gone

Have gone

Went

Gone

Was gone

2.    Anna is here. She___

Has just come

Just came

Is just coming

Is coming

Is coming

3.    `Where is your sister?` - `She a bath`

Have been having

Has had

Has been having

Is having

4.    He___ in the centre of the city

Live

Lives

Is living

Are living

Have

5.    We_____ five days a week

Works

Work

Are working

Working

Have

6.    This pupil ___ a book

Am reading

Are reading

Is reading

Reading

Have read

Расстояние между Гомелем и Могилёвом,раное170км, автомобиль проехал со скоростью 60 км\ч. Определите время движения автомобиля?

Источник тока, ЭДС которого 16 В, замкнут на резистор сопротивлением 6 Ом. Сила тока в цепи 2 А. Определите внутреннее сопротивление источника тока.

Нужно решение.....Ответ:1,18м/с

Закон движения точки по прямой задается формулой s(t)=t^2-3t, где t-время (в секундах), s(t)-отклонение точки в момент времени t ( в метрах) от начального положения. Найдите  мгновенную скорость точки в момент t=2,09с