Open the brackets:

I'm exhausted. I (work) all day.

I (not finished) my homework yet.

You look so tired! What (do)?

Anna has gone to the doctor. She (feel) ill lately.

Where are you? We (wait) for 2 hours!

Write a short essay about Acid Rain. In your essay include:

-What acid rain is

-What causes it

-What effects it has

-What can we do

1)What causes it

2 What can we do

3)What effects it has

4) what acid rain is

1)What causes it

2 What can we do

3)What effects it has

4) what acid rain is

Объяснение:

a - have been

b - have not had. saw 

a - was

b - left. came. have found/ 

1) jane was angry because mark  hadn't calledher since last weekend. (past perfect)

2) sophie had a headache because her baby sister had been cryingall afternoon. (past perfect)

3) joanna had switched the tv off and went to bed.    (past perfect)

4) mike slipped and twisted his ankle while he was playingfootball yesterday. (past continuous)

5) tony was shocked. he couldn't believe what had just happened.    (past perfect)

6) after john had parked the car, he went into the house.    (past perfect)

7) this time yesterday, we were lying on the beach sunbathing. (past continuous)

8) i didn't go out last night because  i hadn't finished my homework.    (past perfect)

9) jack had been working at the company for ten years before he left. (past perfectcontinuous)

10) he  had been drivingfor an hour when the car broke down. (past perfectcontinuous)