［例1］He was cooking some delicious food in the kitchen. Suddenly, he______ (find) that he had run out of salt. So Nick called…
［例2］Last year, my brother and I went to Miami for a vacation. …but the man at the front desk said there had been a mistake. We _____ (tell) that our rooms hadn’t been reserved for that week…
［分析］由tell sb. sth. 可知，用被动语态，表示我们“被告知” ; 又由上下文的时态(如went, said)可知，用一般过去时，故填were told。
［例3］He suddenly appeared in class one day …He walked in as if he ______ (buy) the school…he was from New York City.
1.（2017全国Ⅰ）When fat and salt (remove) from food, the food tastes as if is missing something.
2.（2017全国Ⅰ）Fast food (be) full of fat and salt.
3.（2017全国Ⅱ）Steam engines _____(use) to pull the carriages .
4.（2017全国Ⅱ）Later, engineers _______(manage) to construct railways in a system of deep tunnels (隧道）, which became known to the tube.
5.（2017全国Ⅲ） Sarah ________(tell) that she c