ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
He fell asleep immediately last night; he must ________ (be) very tired.
This diploma ( 毕业文凭 ) ________ that you have completed high school.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Herefusedtotelluswhetherhe________(undertake)thejob.
To succeed in a scientific research project ________.