Sam is very excited ______ the trip because he will be able to see his cousins. 山姆對於這趟旅遊感到非常興奮,因為他會見到他的表兄弟。
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。