I've found your watch. You ________ it on my desk yesterday.
A:left
B:have left
C:forgot
D:have forgotten
由____ 所决定的细胞____ 的过程,就叫细胞凋亡.
有的细胞受到____ 的作用,细胞中____ 物质发生变化,就变成不受____ 控制的、连续____ 的____ 细胞,这种细胞就是癌细胞.
—I think it's important to________local businesses by buying locally.
—I agree with you.
7+6=____
14-8=____
7+9=____
18-8=____
9+7=____
18-9=____
8+8=____
13-6=____