[填空题](frighten) （　） by the explosion, we all rushed out of the hall.

[填空题](frighten)（）by the explosion, we all rushed out of the hall.

[填空题](frighten)（）by the explosion, we ail rushed out of the hall.

[填空题](frighten) ______ by the explosion, we all rushed out of the hall.

[填空题](Frighten) ______ by the explosion, we all rushed out of the hall.

[填空题]All that we really need to plot out the future of oar universe are a few good measurements. This does not mean that we can sit down today and{{U}} (36) {{/U}}the future course of the universe with anything like{{U}} (37) {{/U}}.There are still too many things we do not know about the way the universe is put together. But we do know{{U}} (38) {{/U}}what information we need to fill in our knowledge, and we have a pretty good{{U}} (39) {{/U}}of how to go about getting it. Perhaps the best way to think of our present situation is to{{U}} (40) {{/U}}a train coming into a switchyard. All of the switches are set before the train arrives, so that its path is completely {{U}} (41) {{/U}}. Some switches we can see, others we cannot. There is no doubt if we can see the setting of a switch: we can say with confidence that some{{U}} (42) {{/U}}futures, will not be realized and others will. At the unseen{{U}} (43) {{/U}}, however, there is no such certainty about it. {{U}} (44)