Past tense vs Present perfect

Complete with Past Tense or Present Perfect:

1. They (meet)……………..John yesterday

10. The boy (try)…………………..to solve the problem.at 6 p.m

2. Where (you be)…………..lately?

3. She (not eat)……………….at the party last week.

4. They (get)……………at the market 2 hours ago.

5. She (work)………………here since 1998.

6. You (write)……………….the homework for 2 hours.

7. I (not think)………………of the answer of the problem.

8. What (she buy)………………….for his birthday last night?

9. My parents (marry)………………..in 1979.
10. They (just enter)........................the house.