Larry covered his sandwich ______ a piece of paper. Now no flies can touch it. 賴瑞用一張紙蓋住他的三明治。現在不會有蒼蠅碰到它。
Biology is hard ______ Sandra. She doesn’t like to remember the names of animals or plants. 生物課對珊卓很難。她不喜歡背動物和植物的名字。