用所给单词的适当形式填空。

1. My sister ____________ (buy) presents for me last week.

2. I ____________ (do) my homework now.

3. He often ____________ (play) football with his classmates.

4. There are many ____________ (strawberry) there.

5. I ____________ (sing) and ____________ (dance) with my new friends last night.

6. Let's ____________ (climb) mountains.

7. Mike and Sarah ____________ (be) in Class 1.

8. Did they ____________ (go) skiing?