_________I went to the US,I visited many cities.
| A．First time | B．For the first time | C．The first time | D．By the first time |
We haven't settled the question of ______________ it is necessary for him to study abroad.
| A．if | B．where | C．whether | D．that |
With his work completed, the businessman stepped back to his seat, feeling pleased_____ he was a man of action.
| A．which | B．that | C．what | D．whether |
--- Could you do me a favour?
--- It depends on ______ it is.
| A．which | B．whichever | C．what | D．whatever |
Doris' success lies in the fact _________ she is co-operative and eager to learn from others.
| A．which | B．that | C．when | D．Why |
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 |