He slipped(溜进) into the classroom without ___________.
A. noticed B. noticing
C. being noticed D. was noticed
This special strain of rice makes _________ possible to produce one third more of the crop in the same fields.
A. it B. them C. which D. that
---Is that the small town you often talk about?
---Right, just the one ______________ you know I used to work for three years.
A .that B.which
C.where D.what
Although the first part of the book is easy， the rest ______.
A. has proved difficult B. are difficult
C. is supposed difficult D. have been found difficult
----Where are you now?
----Well, I have arrived at _______ is called “the West lake”.
A. which B. that C. where D. what
If you want to improve your oral English, you’ll first have to _______yourself of those shortcomings.
A. remove B. cut C. reduce D. rid
