1.

We haven't heard from Mariana for ages.

last

It's ages    from Mariana.

2.

Don't wash the dog before we go for a walk: it's pointless!!

worth

It    the dog before we go for a walk

3.

It's a two-hour flight from Buenos Aires to Bariloche.

takes

It    from Buenos Aires to Bariloche.

4.

There isn't any cat food left.

run

We    cat food.

5.

In general, I'd rather not use disposable bottles.

like

I    disposable bottles.

6.

'Why don't we go to the zoo?', said Jennifer.

suggested

Jennifer    to the zoo.

7.

They say the climate is getting warmer.

said

The climate    getting warmer.

8.

In some places people believe a black cat brings good luck.

it

In some places    a black cat brings good luck.

9.

People should make industries pay attention to environmental problems.

should

Industries    attention to environmental problems.

10.

We must protect endangered animal species before it is too late.

need

Endangered animal species    before it is too late.