While other scientists are keeping__ __eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in __ __humans.
| A．a , / | B．an, / | C．the, an | D．an, the |
.
It is said that dogs will keep you _______ as long as you want when you feel lonely .
A safety B company C friend D house
.
He has an extraordinary talent ______ painting and his works have been ______ display throughout the country .
A for in ; B in on ;C for on ; D with on
.
It is no use ________ about the cuisine of our school canteen .
A complaining B complained C to complain D complains
.
The student in our grade is considered _______ money from the classroom and our school is considering _________ him .
A to steal firing B to have stolen , firing C stolen ,fired D to have stolen , fired
.
.______ many times ,I finally comprehended it .
A Told B Having told C Telling D Having been told