He asked us ________ we saw the lost cat or not.
A．that B．what C．which D．whether
After the exam, my teacher told me that failure ____ the mother of success.
A．was B．is C．be D．been
They promised to develop a software package by the end of this year, ________ they might have.
A．however difficult B．how difficult
C．whatever difficulty D．what difficulty
The school board is made up of parents who ________ to make decisions about school affairs.
A．had been elected B．had elected
C．have been elected D．have elected
It’s a ________ clock, made of brass and dating from the nineteenth century.
A．charming French small B．French small charming
C．small French charming D．charming small French
Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
A．had left B．would leave C．was leaving D．has left
