非洲大陆的主要地形是（ ）
A：高原
B：平原
C：山地
D：盆地
一年中，人们如果想在最早时间参加北京天安门广场的升旗仪式，应选择
把下列词语排成一句通顺的话。
①一只 了 先 出来 蚂蚁 同伴 被 救
②它们 表现 人类 确实 一种 出了 应该 我们 所 具有的 品质 道德
—______you study at home in 100 years?
—Yes, I______.
—Sure, I'll do it at once.
It is Saturday morning. My father is ____ the car. I am ____ him. My mother is ____ ____ in the kitchen. Helen is ____ the living room. She is ____ the floor. Where is Tim? What is he doing now? Tim is in his ____ .He is ____. Ben's dog is sleeping too.
