It will be a long time __________ we finally solve the problem of pollution.
| A．before | B．since | C．when | D．Until |
They got to the railway station, _______ the train ________.
| A．finding; had left | B．to find; had left | C．found; left | D．to find; leaving |
Lincoln had very little free time ______ he could spend studying then.
| A．when | B．in which | C．at which | D．which |
It is the place _____ I once visited when I was young.
| A．that | B．in which | C．where | D．at which |
Put the book ______ it should be when you’ve finished reading it.
| A．how | B．which | C．where | D．who |
It is said that the __________ temple was built 1500 years ago.
| A．stone fine old | B．stone old fine | C．fine old stone | D．fine stone old |