пожалуйста помогите)
I. Выберите правильную форму глагола
1. ... you ring your friend up yesterday?
a) do b) did c) are d) were

2. ... she reading an English book?
a) do b) does c) is d) are

3. ... he work at your plant?
a) do b) does c) is d) was

4. They ... discussing some problems when he entered the room.
a) do b) did c) are d) were

5. She ... very busy last week.
a) is b) was c) did d) does