Schools across China are expected to hire 50,000 college graduates this year as short-term teachers, almost three times the number hired last year, reduce unemployment pressures.
| A．help | B．to have helped | C．to help | D．having helped |
The computer centre, ______ last year is very popular among the students in this school.
| A．open | B．opening | C．having opened | D．opened. |
Mrs Smith warned her daughter ____ after drinking.
| A．never to drive | B．to never drive | C．never driving | D．never drive. |
The murder was brought in, with his hands _______ behind his back.
| A．being tied | B．having tied | C．to be tied | D．tied |
It is no use _____to come now. He is busy.
| A．ask him | B．to ask him | C．that you ask him | D．asking him |
Charles Babbage is generally considered ______ the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |