The scientist knows nothing about the matter, because he is always ______ himself in scientific study.
| A．burying | B．devoting | C．focusing | D．concentrating |
David helps his mother with the housework every Saturday for abou_________t.
| A．one and half hours | B．a half and an hour |
| C．an hour and half | D．one and a half hours |
Li Ping was born_________ .
| A．in the year 1984，at 10 a.m.on June 18th |
| B．on June 18th at 10 a.m.in the year 1984 |
| C．at 10 a.m.in the year 1984 on June 18th |
| D．at 10 a.m.on June 18th in the year 1984 |
________people in the world enjoy football.
| A．Several million | B．Many millions |
| C．Several millions | D．Many million |
He’s working hard for fear that he__________.
| A．should fall behind | B．fell behind |
| C．may fall behind | D．would fall behind |
Mary__________my letter;otherwise she would have replied before now.
| A．has received | B．ought to have received |
| C．couldn’t have received | D．shouldn’t have received |