The little girl kept _____ the house, because she wanted to keep it _____.
| A．cleaning; clean | B．cleaning; cleaning |
| C．clean; clean | D．clean; cleaning |
___________ the three questions, which one is the most difficult to answer?
| A．As | B．In | C．Than | D．Of |
The Yellow River is __________ river in China.
| A．the longer | B．the longest | C．the second longest | D．longest |
The students come to school early, but the teachers come __________.
| A．much earlier | B．much early | C．more earlier | D．the earliest |
--We spent all our money because we stayed at the most expensive hotel in town.
--Why didn’t you stay at _________ one?
| A．a cheap | B．a cheaper | C．the cheap | D．the cheaper |