I will never understand how it ______ that you failedin the examination for you are such a good student.

8．—Isn’t it a surprise that I happened to meet Emily at Doris’ birthday party last weekend? —If my memory serves me correctly, you__________each other for exactly three years

Not easy as the problem of pollution is ____, no one should just stop trying.[ ]

"We will learn Englishwords this year," the teacher said to the students.

29The key ____ English well is to read more when ____