What’s the matter,Mary? You look ________!-My wallet is nowhere to be found,and my identification card (身份证) is in it.[ ]

Up till now we _______ four units and this will be the second time that we _______ a test

_______exciting experience it is to climb Mountain Tai!

Though he doesn’t achieve his goals, he is not a failure．___, he is remembered as a true hero．

How many workers are there in your factory, Mr Brown—________ workers in our factory _________2000.