Choose the correct variant. Write down five words with a comma (,).

Примечание:

После запятой не забудьте поставить пробел. ответы нумеровать не нужно. Также не требуется точка.

1. We had dinner at the restaurant (after/until) we finished working.

2. The phone rang (until/as soon as) he entered the flat.

3. They were walking down the street (after/when) they saw their friend Jack.

4. Please don’t forget to lock the door (before/after) you leave.

5. The boy waited (until/as soon as) his parents picked him from the kindergarten.

The problem of water pollution is especially acute in densely populated countries. In some regions of the planet, not only drinking water is lacking, in the dirtiest rivers it is unsuitable even for domestic needs.

Water purification is one of the ways to solve the problem of water pollution. Business owners should attend to the installation of quality treatment facilities. The presence of such devices, of course, is not able to completely stop the release of toxic substances, but they are quite capable of significantly reducing their concentration.

The use of recycling water supply technologies many times reduces the amount of harmful emissions, reduces actual water consumption, and reduces the loss of raw materials in production. In the process of purification, valuable substances that have got into the water during the production process are extracted from the contaminated liquid.

1.) What were your friends celebrating the whole evening yesterday?

   How long were your friends celebrating granny's birthday?

   Who were celebrating granny's birthday the whole evening yesterday?

   When your friends were celebrating granny's birthday the whole evening?

2.) What Mary was doing at 10 o’clock yesterday?

    When Mary was passing the exam?

    Who were passing the exam at 10 o’clock yesterday?

    At what time Mary was passing the exam yesterday?

3.) Peter broke his leg on the previous week

   What did Peter broke on the previous week?

   When did Peter broke his leg?

   Who broke his leg on the previous week?

   What happened to Peter on the previous week?

4.) Students translated the text on a previous lesson

   What did students translate on a previous lesson?

   Who translated the text on a previous lesson?

   When did students translate the text?

   What did students do on a previous lesson?

5.) Ann drew a doll yesterday

   Who drew a doll yesterday?

   What did Ann draw yesterday?

   What did Ann do yesterday ?

   When did Ann draw a doll?