He fell off the bike ________.
A. while he rode B. while he was riding C. while he is riding D. while on bike
The students were all tired but ________ of them stopped ________.
A. no, to rest B. none, to rest C. no, resting D. none, resting
He is a teacher. He has been a teacher ____ 1990.
A. in B. until C. since D. For
Italy is famous for ________.
A. the Eiffel Tower B. the Tower Bridge
C. the Leaning Tower of Pisa D. The Little Mermaid
My brother has never been late for work, __________?
A. is he B. isn’t he C. has he D. hasn’t he
This is a cheap and simple process(过程), ____ ,there are dangers.
A. but B. so C. because D. However
