The factory has been ________ for two years.
| A．open | B．to open | C．opening | D．opened |
These shoes look very good. I wonder __________.
| A．how much cost they are | B．how much do they cost |
| C．how much they cost | D．how much are they cost |
—What did your parents think about your decision?
—They always let me do __________I think I should.
| A．when | B．that |
| C．how | D．what |
Nobody believed his reason for being absent from class__________he had to meet his uncle at the airport.
| A．why | B．that |
| C．where | D．because |
—It’s thirty years since we last met.
—But I still remember the story, believe it or not, __________ we got lost on a rainy night.
| A．which | B．that |
| C．what | D．when |
— Could you do me a favour?
— It depends on __________ it is.
| A．which | B．whichever |
| C．what | D．whatever |