（题文）
【小题1】（小题1）Nodding the head means a    .
【小题2】（小题2）L__________are sour but they are my favorite fruit.
【小题3】（小题3）The scientists e_________all the leaves under the microscope(显微镜).
【小题4】（小题4）He showed great c_____when he jumped into the river to save the child.
【小题5】（小题5）I will d__________my parents if I fail the examination.