4. Put questions to the following sentences. a. Every year many animals, plants, fish and insects are lost forever.
b. We can not get back the lost animals.
c. People cut down trees that support different kind of life.
d. Many animals are becoming endangered.
e. Every year there are fewer elephants.
f. The pollution also poisons animals or kills the plants.
g. Pollution is very dangerous for future life.
h. We need to protect the Earth from pollution.​

Insects are one of the oldest wildlife of our planet. Today, according to scientists the number of known species of insects has reached nearly two million different species. And every year on this list is added about seven thousand species of insects that have been previously zoologists do not even have a clue . Settling insects gradually , over time, occurred throughout the earth. You can meet them in tropical countries of Africa, and in the temperate latitudes of the Northern Europe. Even in the polar regions and arid deserts insects have adapted to life. There are also domestic insects that are adapted to live in close proximity to humans . Anyone with a child known types of insects such as butterflies , bees , beetles , bugs, flies, mosquitoes and many others. Every child is faced with leaving them in the first to the garden for a walk. Perhaps these are the first representatives of the wildlife encountered by the kid in your life . Structure of the insect is very interesting little child , as it is divided into three notable parts: head , abdomen and chest. Each insect has three pairs of legs and one , and sometimes two pairs of wings . Also, all the insects peculiar antennae on his head, that perform their function senses. In human terms insect life is very short and therefore its development is very fast . The whole cycle of formation lasts no more than six weeks and consists of four periods . Adult insects lay eggs from which larvae emerge in the future , and after some time of larvae formed pupa . And only from the pupa appears already Adult , shaped , viable insect. Insect life is very diverse and fascinating to watch , especially nice to look for insects such as bees and ants , whose activities are , in addition, are useful to humans.

1.The children went straight home. (after/they/had finished/their classes)
2.The teacher came into the classroom. (by the time/the children/had taken/their seats)
3.We left the house. (after/the rain/had stopped)
4.You rang up. (when/the guests/had not come/yet)
5.You entered university. (after/you/had studied/English)
6.I came into the room. (by the time/the lecture/had begun)
7.The house was empty. (as everybody/had gone/to the party)
8.They went home. (after/they/had finished/their work)
9.I met you in the street. (after/you/had seen/a new film)
10.He couldn’t take part in the competition. (because/he/had broken/his arm)