语法填空
（1）Fast food ________ (be) full of fat and salt; by    68 （eating）  (eat) more fast food people will get more salt and fat than they need in their diet.
（2）Sarah says, ＂My dad thinks I should take the offer now. But at the moment, school ______(come) first. I don’t want to get too absorbed in modeling.
（3）Later, engineers ________(manage) to construct railways in a system of deep tunnels (隧道）, which became known to the tube.