— How clean the classroom is!
— Yes, I am sure someone it.
| A．has cleaned | B．cleans | C．cleaned | D．had cleaned |
I ____ that he get some professional advice.
| A．recommend | B．recognize |
| C．acknowledge | D．admit |
The shortage of affordable housing is not ____ a Beijing problem
| A．delicately | B．sufficiently |
| C．exclusively | D．effectively |
Another car crashed into mine just as I was ___ away from the parking place .
| A．drifting | B．running |
| C．walking | D．pulling |
Mother’s Day ____ on the second Sunday of May, a different date every year.
| A．celebrates | B．falls |
| C．observes | D．cheers |
People often ____ all sorts of warning signals about their own health.
| A．convince | B．evaluate |
| C．overlook | D．organize |