Thosewho’dliketovisittheexhibition________(sign)yournameshere.

Wooddoesnotconductelectricity;________.

I found ________ to answer all the questions within the time given.

We were busy ________ (get) things ready for the trial production when he phoned us.

ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.