срочно, Помогите пожалуйста по английскому!! 50 балов. 4,5 и 6 задания​

4.

a) I have just finished the work.

Have you seen my new picture?

b) The firm had shipped the goods by the 1st of March.

Mr. Sedov had left Moscow before I came there.

5.

a) The doctor was sent for ten minutes ago. - За доктором послали 10 минут назад.

b) Articles are translated by her from English into Russian every week. - Каждую неделю статьи переводятся ею с английского на русский.

c) Many questions were asked by our students after lectures. - После лекций нашими студентами было задано много вопросов.

6.

a) Houses are built very fast now.

b) My flat is bigger than yours.

c) It was raining the whole day yesterday.

d) My friend gave up smoking. (stopped smoking не годится, это значит "перестать курить начатую сигарету", а не отказаться от привычки)