Present Perfect and Past Simple

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

I ______ two letters yesterday.
1. wrote
2. have written
We have not done much ______ the last week.
1. for
2. since
I have been very busy ______ last week.
1. since
2. for
Eggs ______ more expensive this month.
1. have become
2. became
They ________ at the same hotel for ten years.
1. have stayed
2. stayed
I ______ this class now for two years.
1. have taught
2. taught
I ______ him at the theatre last evening.
1. saw
2. have seen
We ______ to the seaside last summer.
1. went
2. have gone
I have been looking for you ______ two hours.
1. for
2. since
He ______ a teacher when I knew him.
1. was
2. has been