_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
There is a new problem involved in the popularity of private cars _______ road conditions need _______.
| A．that … to be improved | B．which … to be improved |
| C．where … improving | D．when … improving |
Let’s observe another little scene, ________you might have in your new life to come.
| A．what | B．as | C．where | D．that |
I felt it a great honour ______ to speak to you.
| A．to ask | B．asking | C．to be asked | D．having asked |
Tony was very unhappy for _______ to the party.
| A．having not been invited | B．not having invited |
| C．having not invited | D．not having been invited |
Before the war broke out, many people________possessions they could not take with them in safe places.
| A．threw away | B．put away | C．gave away | D．carried away |