多边主义行不行、好不好,( )是一面镜子,也是一个标杆。
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If you are sitting or standing upright, you are _________________.
A. making your back straight
B. bending
C. lying down
D. jumping
Postmen send ________________(分类的信件)to different places.
He ____________________(拼命地训练)for the race, sometimes running as much as 60 miles a week.
When my older twin sisters ______________________________(开始对音乐表现出来兴趣),Harriet Anne learned to play Grandma's upright piano, while Suzanne turned to Daddy's violin.