A beam of light will not bend round corners unless ________ (make) to do so with the help of a reflecting device
made
暂无解析
Ifound________toanswerallthequestionswithinthetimegiven.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.