mprehensive surveys have provided the most__________statements of how, and on whatbasis, data are collected.

He must be in the reading-room, _____ he?

The teacher _____ her new students to be diligent.

―When was the house built―It was built in 1949 _______ the PRC wasfounded．

Uncle Li has been working in the factory for more than thirty years, so he deserves .