1)

1.has started 

2. have decided 

3.has phoned

4. have cycled

5.have studied

6.has cooked

7.has landed

2)

1.know-knew-known

2.write-wrote-written

3.sleep-slept-slept

4.sell-sold-sold

5.think-thought-thought

3)

1.seen

2.gone

3.left

4.won

5.eaten

6.done

7.broken

4)

2.has stoped

3.have arrived

4.have had

5.have spoken

6.has finished