动词填空：根据句意，用动词的适当形式完成句子。
Listen! There are some birds ______ (sing) in the trees.
The policeman tells the boys ______ (not play) football in the street.
These flowers make the garden ______ (look) beautiful.
---Where’s David?
---He ______ (fix) his bicycle.
I am quite sure there ______ (be) a ‘Helping Hands’ meeting tonight.
It’s so cloudy outside. I think it ______ (rain) later.
The little girl ______ (share) a bedroom with her elder sister.
Mary with her family ______ (visit) the Great Wall next Sunday, isn’t she?