Помогите сделать 1 Unfortunately, we .... cut down the old trees

Помогите сделать

1 Unfortunately, we .... cut down the old trees in the park last year.
a) have to b) will have to c) had to
2 Where are the children?- They ... Lotto in the living room.
a) are playing b)play c) played
3 They .... their work a month ago. Now there is a nice pond in the park.
a) start b) started c) have started
4.The scientist ... his book about rare insects yet .
а)won't ... finish b)didn't ... finish c)hasn't finished
5....you...a good time yesterday?
a)Do...have b)did... have c)have ...had
6.... you ... me to set the table?
a)do help b)did help c)will help
7.Peter is fond of sport. He...football three times
a)play b)plays c) is playing
8....you... the Tower of London?
а)do...visit b)have...visited c)did...visit