用所给词的适当形式填空。

1. Maria _____ (can) speak when she was two years old.

2. — Look! Tom is having lunch.

    — Yes, he often _____ (have) lunch at half past twelve.

3. Do you enjoy _____ (play) basketball?

4. We should _____ (finish) the work on time.

5. The boy _____ (stay) up until the TV said goodbye.

6. ____ our sister _____ (have) any milk?

7. Why _____ (not tell) me about it early?

8. —_____ they _____ (go) home yesterday?

    — Yes, they did.

9. They each _____ (have) a CD in their bags.

10. It is a good time _____ (sing) now.

重要物资的供应商关系策略，要达到（）的目标。

A、稳定资源

B、控制风险

C、实现采购总成本最低

D、降低采购质量