Had they known what was coming next, they ___________ second thoughts.
| A．may have | B．could have | C．must have had | D．might have had |
This is the factory my father worked ten years ago.
| A．where | B．that | C．which | D．when |
He tried his best to solve the problem, difficult it was.
| A．no matter what | B．whatever | C．however | D．how |
They looked very excited they had won the football game.
| A． even though | B． even if | C． though | D． as if |
I used to live near the People’s Park is the centre of town.
| A． which | B． where | C． in which | D． what |
They talked for about an hour of things and persons ________ they remembered in the school.
| A．which | B．that | C．who | D．whom |