一个物体在光滑水平面上以初速度v0做曲线运动，已知在此过程中只受一个恒力F作用，运动轨迹如图，则由M到N的过程中，速度大小的变化为（ ）
根据句意及汉语提示完成单词
①There's a____（电脑）on the teacher's desk.
② What can you see in the____（图片）?
③ Is there a____（电视）in Lucy's room?
④There isn't any ____（家具）in the old house.
⑤The old man is ____（九十）years old.
