I)
1. C in ( năm dùng "in" )
2. B. million ( 400 million years ago: 400 triệu năm trước )
3. A. underground ( underground rivers: những con sông ngầm )
4. A of ( a range of + N )
5. B attractions ( điểm tham quan )
II)
1. It is still fresh.
2. She used to start her day at 4 o'clock.
3. She used to listen to the radio in her pastimes.
4. They used to sit by the fire in the sitting room.
5. She usually showed him which herbs to use to cure the illness.
Xin hay nhất ạ