Wooddoesnotconductelectricity;________.
A、sodoesn’trubberIknowitisn’timportantbutIcan’thelp________aboutit.
Tosucceedinascientificresearchproject________.
________ (fail) several times, they need some encouragement.
I found ________ to answer all the questions within the time given.
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
