Hismotherbecomesdisappointedwheneverhefailstoliveuptoher________(expect)

For those involved, the scandal has been a very________(pain)experience

时差反应是每个国际旅行者可能遇到的问题。翻译

Being a ________(high) motivated lauguage learner, he takes every opportunity to improve his English

Expertshavefoundthatnormalsleepcanbedividedintofive______stages