There are so many foggy days these years. We all wonder ______________________.
A. what can we do to prevent it
B. what we can do to prevent it
C. how can we do to prevent it
D. how we can do to prevent it
You will never guess ________.
A.who am I waiting for B.what has happened
C.how can she help me D.where did I go
Work hard ， ________ you will fail the exam .
A. but B. so
C. or D. and
It will take a lot of time, so you must be ______, young man.
A. quiet B. patient
C. creative D. active
--- _____ will you stay there for the show?
--- Until the day after tomorrow.
A. How often B. How soon
C. How far D. How long
_________ unusual experience you had in the USA!
A. What a B. What an
C. What D. How
