"Harry Potter" is one of the most popular novels with many fans ________ was written by J. K. Rowlin.
A.that B.what C.who
— How time flies! It is four years ________ we first met each other in the classroom.
— I can't imagine leaving school soon. Don't be sad. We are friends forever.
A.when B.since C.after
— Could you tell me ________?
— Sure, you had better watch some English movies.
A.how I can improve my English
B.how can I improve my English
C.why I can improve my English
Most Americans remember what they were doing when the World Trade Center in New York was ________ by terrorists.
A.turned down B.taken down C.fallen down
— Why are you so uneasy?
— I've ________ all my bedroom but I still can't find my key to my bike.
A.looked for B.found C.searched
John ________ in this beautiful city for ten years while he ________ to Beijing in two days.
A.was; moved B.has been; will move C.has came; moved
