Present Perfect versus Simple Past

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Present Perfect versus Simple Past. Choose the right words and expressions to complete the following sentences in Present Perfect or Past Simple Tense.

We ______ for one hour this morning. (and it is still morning)
1. have played
2. played
He has walked ______ three hours.
1. for
2. since
I have been very busy ______ last week.
1. for
2. since
I ______ the horse this morning. ( It is 9 am )
1. have ridden
2. rode
We ______ since early yesterday morning.
1. have worked
2. worked
He ______ on Sunday.
1. studied
2. has studied
We have worked ______ two days.
1. for
2. since
He ______ his mother when she was sick.
1. helped
2. has helped
We _______ the park last year.
1. saw
2. have seen
I _______ him for many years. (he is still alive)
1. have known
2. knew