Open the brackets:

1 He just (write) a new book.

2 I (study) hard when I (be) at school.

3 He (go) out half an hour ago.

4 His sister always (give) me a book to read.

5 What (happen) now?

6 The book (speak about) much.

7 The substance (receive) by this scientist two years ago.

8 He just (ask) a difficult question by his teacher.

9 A telegram (send) by him tomorrow.

10 The article already (translate) into English.