阅读短文，从方框中选择适当的单词填空 (每词限用一次)。

    Last weekend, we went to the countryside to have a picnic. We made some sandwiches to take  us for lunch. We left quite early and there was not too much traffic at that time. After about two hours, we came to a nice . The water was very clear. After a swim, we had lunch under the trees. Then we went for a walk.

    We saw some  birds and butterflies. After walking for an hour, we returned to our  and began to drive home.

We got home very late and we were . But we enjoyed ourselves very much.