用所给单词的适当形式填空。

1. They are ______ (go) for a drive this weekend.

2. Maria won first prize in yesterday's______ (sing) competition.

3. I helped Sally ______ (buy) a new watch.

4. There ______ (be) a pen and some pencils in my bag.

5. ______ you ______ (go) to the zoo?

    — No, I didn't.

患者疑寰枢关节脱位，请从下列中选出最佳体位

A．颈椎正位

B．颈椎侧位

C．颈椎斜位

D．1、2颈椎张口位

E．颅底切线位