01 次の文の( )内から適する語を選び,○でかこみなさい。
(1) When was the computer (invent, inventing, invented)?
(2) What was Tom (do, doing, done) by the tree?
(3) Was he (helped, helping) you with your homework?
(4) Why were the books (put, putting) on the table?
(5) What were they (put, putting) on the table?