I'm going to get _______ this afternoon.
| A．these letters mailing |
| B．mail the letters |
| C．to mail these letters |
| D．him to mail the letters |
Don't pretend ________ when you don't.
| A．knowing | B．know | C．to know | D．to knowing |
There are forty-five students _______ in our class.
| A．about | B．or so | C．around | D．so |
—By the way，have you moved into the new house?
—Not yet．The walls ________．
| A．were painted | B．are being painted | C．are painted | D．are painting |
It is reported that the floods have left about ________ people homeless．
| A．two thousand | B．two thousands | C．two thousands | D．two thousands of |
Great attention must be paid ________ education，especially in the countryside．
| A．develop | B．to develop | C．to developing | D．developing |