No one in the factory but the brothers _____ that our factory will be closed because of the financial problem.

I don’t know _______. ––You can go and ask Jack.

Many strange new means of transport have been developed in our century, the strangest of _____ being perhaps the hovercraft(气垫船).

Each person’s fingerprint is unique, ________ it an ideal identification tool.[ ]

I couldn’t imagine ______difficult it was for thesebadly injured victims to make it to the hospital.