用所给词的适当形式填空。

1. My family _______ (decorate) our house before Christmas every year.

2. We _______ (celebrate) Christmas with a family meal.

3. I _______ (send) some Christmas E-card to my friends last year and I _______ (be) really happy

to _______ (make) a contribution to the environment protection.

4. People always _______ (sing) Traditional Christmas songs at Christmas.

5. My mother with my little sister usually _______ (go) shopping before Christmas.

6. My classmate, Xiao Ming, never _______ (go) to the parks on weekends. She just _______ (do)

homework. She _______ (study) hard. But I ______ (not agree) with her. I _______ (think) she’d

better _______(have) a rest after hard work.

7.Mike ______ (not feel) well. He ______ (feel) sick, and his parents ______ (look) worried.

气门间隙是给配气机构零件受热膨胀时留出的余地，保证气门（）。