Whose shirt is this Is it Tom’s —No, it isn’t, ______ is white.

Officials believe that more than one person _____ for the big fire. [ ]

Henry works as a teacher now, but he ______ on a farm for three years

What do you usually use your computer __________ — I usually use it to do word processing.

Would you mind ____ the window -Of course not.I feel hot,too.