Ipreferthisdiagram________thatone.
A、thanHowlong________they________(dig)theditch?
Heaskedmewhethermybrother________(fly)toBeijing.
Hotmetal________asitgrowscooler.
Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
