Hardly could he ________ this amount of work in such a short time.
Gun control is a subject ____ Americans have argued for a long time.
I travel to the Binhai New Area by light railway every day, ____ do many businessmen who live in downtown Tianjin.
A person ____ e-mail account is full won't be able to send or receive any e-mails.
The child wants to ____ the watch to see what makes it work.
During the Second World War, once before, the U-boats had been _____ because of air attack.