How old are you—- _____________.

omprehensive surveys have provided the most statements of how, and on what basis, data are collected.

the morning train, he would not have been late for the meeting.

You can’t imagine the hard timehe had ______ the horse in. A. holding B. tohold C. held D.hold

The most important thing ______ we shouldpay attention to is the first thing ______ I have said.