I __________________ an interesting book two days ago. (read)

• read

• was reading

While he __________________ a formula on the blackboard, I was dreaming. (write)

He __________________ Biology last week. (learn)

• learned

• is learning

He __________________ his homework at 5 o’clock yesterday. (do)

• to do

• was doing

My friend __________________ yesterday. (sleep)

They __________________ at school yesterday. (be)

I __________________ him yesterday. (see)

I __________________ the poem for an hour. (learn)

The teacher __________________ the exercise to the students. (explain)

We __________________ a Music lesson at ten o’clock yesterday. (have)