Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Heaskedmewhethermybrother________(fly)toBeijing.
A beam of light will not bend round corners unless ________ (make) to do so with the help of a reflecting device
How long ________ they ________ (dig) the ditch?
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Wooddoesnotconductelectricity;________.
