The research on the new bird flu virus vaccine ischallenging and demanding Who do you think can do the job–________ my students have a try

Look! Laura is getting the first place. fast runner she is!

Are you sure that you can finish the job on time ,Jayce–Yes ,nothing can______ my success.

You shouldn’t ___ you hope .Everything will be better.

He may be________of playing his radio tooloudly by law，especiallywhen it is time for sleeping.