—___________ had dinner with his friends?
—Sam did.
雷达是依照某种动物的回声定位原理发明的，这种动物是（ ）
Let him _______ a rest. I think he must be tired after the long walk.
请给加下划线字注音。
执拗____ 馈____赠 镶嵌____ 长吁____短叹
