2 . _________________________ that these were signs of ______________ tsunami.
她立刻意识到这是海啸来临的征兆。

5 . 在一个小时内完成这份试卷对我来说是个费劲的事。(struggle)

6 . 课内语法填空：根据所学语法知识，用适当语法结构填空，完成下列句子。
1. You'd better speak slower so that you can make yourself ______.(understand)
2. Pigeons have a wonderful sense of direction, which is why people in ancient times got them ______ (carry) messages.
3. Millions of Britons listened to the inspiring speech by Queen   Elizabeth II, ______ wisdom offered hope to them under lockdown.
4. The boy dived into the water and after ______ seemed to be a long time, he came up again.
5. The director was advised to give the task to ______ had a strong sense of responsibility.
6. ______ remains to be seen when students can attend school without wearing face masks.
7. ______ is known to all, the Pearl Harbour attack led to the US entering the Second World War.
8. The teacher, as well as some students ______ (be) going to visit the city museum tomorrow.
9. Generally   speaking, the old ______ (be) able to give us good advice due to their experience and wisdom.
10. It was at the age of fifteen ______ Louis Braille created a system with patterns of six raised dots representing each letter.