Those who’d like to visit the exhibition ________ (sign) your names here.
sign
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Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
This diploma ( 毕业文凭 ) ________ that you have completed high school.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
He fell asleep immediately last night; he must ________ (be) very tired.
Iwonderifhecouldgetit________(do)beforetomorrow.
