Most Americans would prefer to keep their problems _________ themselves and solve their problems __________ themselves.
| A．to ,by | B．by ,to | C．for,to | D．in,on |
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 |
—Was it in April, 1970 that China ________ sending its first satellite into space?
—Yes, that's right.
| A．succeeded in | B．managed to | C．attempted in | D．tried to |