根据句意，用所给动词的适当形式填空。
Winter is the best season            (go) skiing.
I often see my father        (read) the newspaper on the sofa.
It is very important for us            (exercise) more often.
The heavy rain prevents us from           (go) for a picnic.
Not only they but also Jim _______ (watch) the birds in Yancheng Nature Reserve now.