Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
| A．it; it | B．what; what | C．what; it | D．it; what |
The scientist was rewarded by the government forsuch a great，contribution to the country．
| A．make | B．making | C．being made | D．having made |
Too high house prices can be brought under control，the authorities introduce a series
of regulatory policies．
| A．even if | B．as if | C．so that | D．provided that |
all kinds of difficulties，the workers have made rapid progress in the construction of
the World Expo 2010 Shanghai．
| A．With | B．For | C．Under | D．Beyond |
—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！Ifor it．But I haven’t decided when to do it．
| A．have prepared | B．had prepared |
| C．have been preparing | D．was preparing |
a diary every day and you’ll improve your writing．
| A．Keeping | B．To keep | C．Keep | D．If you keep |