根据句意，用所给词的适当形式填空。
If you can go closer to the birds, you can _______ (easy) watch them.
If we do nothing, there will be no pandas __________(leave).
His ____________(ill) is very serious, the doctor is saving his life.
Would you please speak a little __________(loud)?Ｉcan’t hear you.
I like autumn, because it’s always              (sun).