10 1. the children screamed/were screaming when the lightning bolt struck/ was strucking a tree in their garden. 2. they watched/were watching tv when the earthquake happened/was happening.

my friend works at factory because he's a metallurgist. another friend is an advising seller of electronic equipment and clerical aids, therefore he works at office. his home is quite close to the office.

1) are

2) shall have

3) went and bought

4) did answer

5) will go