1 . _______ is no wonder that such a top student is addicted to online games. (用适当的词填空)

2 . It’s a challenge for me to ______ (memory) 50 new words per day. （所给词的适当形式填空）

4 . The other day, ________ occurred to Johnson that he should make a road trip to help the needy. (用适当的词填空)

5 . ______ is acknowledged to us all that the old scientist, for whom life was hard in the past, still works hard in his eighties. (用适当的词填空)

6 . ________suddenly occurred to Miranda that perhaps no one would believe her story. (用适当的词填空)

7 . 关心家人是我们的责任。（汉译英）

8 . _____is known to us all that the 2022 Olympic Winter Games will take place in Beijing. (用适当的词填空)

9 . _____________never occurred to me that he would fail in the exam. (用适当的词填空)

10 . It suddenly occurred to him _____ he had left his keys in the office.