Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
Themorewelookedatthepicture,________.
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Iknowitisn’timportantbutIcan’thelp________aboutit.
