They _____ be at home. You see, the door is locked from the outside.
During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
Our waste recycling project ________ a lot of investigation and paperwork had been done by the end of last term.
Every morning Jack's wife will stand before the mirror, ________ carefully until she has to go to work.
________ for a whole night, we still couldn't agree on when to start and where to go for the holiday.
In my opinion, keeping dogs well ________ up is advisable for dog owners.