Present Perfect и Past Simple.

Помогите с тестом, хоть некоторые вопросы. Заранее спасибо!
1. He... a teacher for three years
a) was b)has been c)have been
2. Helen isn't here. She ... to the
a)went b) has been c) has gone
3. Steve ... a new bike last week.
a) bought b) have bought c) buys
4. Mr Thompson ... here in 1995
a) come b) has come c) came
5. When ... school?
a) did you leave b) have you left c) do you left
6. W. Shakespeare ... over four hundred years ago.
a)was born b)has been born c) were born
7. "The Mayflower" ... at Plymouth Rock in December, 1620.
a) has landed b) had landed c) landed

Спасибо большое! :D

1. He... a teacher for three yearsa) was b)has been c)have been2. Helen isn't here. She ... to the a)went b) has been c) has gone3. Steve ... a new bike last week.a) bought b) have bought c) buys4. Mr Thompson ... here in 1995a) come b) has come c) came5. When ... school?a) did you leave b) have you left c) do you left6. W. Shakespeare ... over four hundred years ago.a)was born b)has been born c) were born7. "The Mayflower" ... at Plymouth Rock in December, 1620.a) has landed b) had landed c) landed