Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
A、canyou“Haveyoumovedintothenewflat?”“Notyet.Therooms________(paint).”
You________gonow.It’sgettinglate.
Ipreferthisdiagram________thatone.
Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
Themorewelookedatthepicture,________.
