Нужно. think about the following we buy many products that we don`t need. this shows that we are being manipulated by large, evil corporations.

1. lena is a very good girl. she always helps her mother about the house. today she has been helping her mother since morning. she has already washed the floor and dusted the furniture.

Baobab - a kind of tree.  baobab - one of the thickest tree in the world.  the average circumference of the barrel in the baobab is 9-10 meters, with the height of the tree is in the range of 18-25 meters and the diameter of the crown reaches 40.from october to december baobab blossoms.  flowers in the baobab large, white with five petals.  they are disclosed in the late afternoon and last only one night.  in the morning the flowers wither, acquiring an unpleasant putrid odor, and fall off.following the developing fetus, which resemble cucumbers coated with a thick hairy skin.  inside the fruit are filled with pulp with black seeds.  the fruits are edible.because of addiction to them baobab monkey called "monkey bread tree."the average life expectancy of baobab "only" 1,000 years.local residents have been used almost every part of the baobab.  from its rough bark produce fiber for the manufacture of fishing nets, ropes and fabrics.  from the ashes of the bark of baobab are quite effective medicine against colds, fevers, dysentery, heart disease, asthma, toothache, insect bites.young leaves are added to salads, used as dry spices.  young shoots are boiled like asparagus.flower dust used to make glue.baobab - a treat for elephants.  african giants eat them almost entirely, not just the leaves and branches, and trunk. the oldest baobab 6,000 years    

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)