Scientists .......... research into environmental pollution for years. 

Edmund Hillary became famous for climbing...

......... using solar energy?

How long ...... through the rainforest? 

Elephants are ........ land animals. 

............. on the beach for three hours?

They plan to explore .............. in a small boat. 

The beach is very dirty because people ......... their rubbish with them. 

I’ve been learning to play ............. and now I want to buy one

........... cleaning up the park yet?

She ........... lately because the pool is closed. 

He’s been exploring the jungle .......... February. 

This type of tiger lives in ........ India. 

He ............... collected any shells from the beach. 

......... your science project at home?

....... orangutans is a species of ape that's near extinction. 

The manufacturing company ...... used plastic to make these toys. 

The biologist discovered this species of fish ...........

We saw a dolphin yesterday. .............. dolphin was following our boat. 

Did you hear about ...... which was washed up on the shore yesterday? 

Write the correct form of the verb:

Why they (cut down) all the trees in the park? 

Write the correct form of the verb:

Residents (complain) about the rubbish for weeks now. 

Write the correct form of the verb:

I (just read) a fascinating article on koala bears. 

Write the correct form of the verb:

It (rain) all morning yesterday.

Write the correct form of the verb:

We’re tired because we  (clean up) the beach for five hours now.