Present Perfect, Present Simple, Present Continuous, Past Simple или Past Continuous.
11. Where (is) your brother? — He has just ( come) home. He (is taking) a
shower in the bathroom now. 12. As soon as I (saw) him, I (
understood) that he (was working) hard. He (was writing) something and (did not
notice) anything. 13. When I (came) home yesterday, the children (were
running) and (singing) merrily. "We (have learnt) a new song!" they cried. 14.
When the young man (entered) the room, she (looked) at him in surprise. "What do you (want) to teil me?" she (said). "Why have you (come)?" 15. It (was raining) hard when I (left) home
yesterday, so I (returned), (put) on my raincoat and (started)
again. 16. Are you ( working) right now? — Yes, I (am preparing) for the
English exams. 17. Have a look! That (tis) the Golden Gate Bridge on
your left. — Oh, it (is) beautiful. I have just ( taken) a picture of it.
18. Where did you ( learn) the news? 19. Have they already ( thought) of
everything? Have they (bought) a lot of food? — Yes, Mark has just ( ordered) ten
bottles of Соке and four kinds of mineral water. He (mentioned)
peanuts, but he (has not ordered) any. He (was thinking) of tea and fancy
cakes. The shop (charged) everything to Mark's credit card. 20. Why
are you ( shivering)? — I (am shivering) because I (am) cold. 21. I (have
sprained) my ankle again. 22. A world-famous Violinist (is playing) at
tonight's concert. 23. The children (were playing) with their train set the
whole evening yesterday.