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?
