With some technical problems to be solved, it may be a while _______ the system is put into use.
| A．when | B．after | C．since | D．before |
In front of ______ remained of my old house,I took some pictures,which called up my childhood.
| A．where | B．which | C．what | D．the place |
It’s on the festival occasions ______ the family get together______ he misses his father.
| A．where; that | B．which; when | C．when; which | D．that; that |
When I opened the door, I found my father sitting in his chair, completely ______ in a magazine.
| A．absorbed | B．focused | C．losing | D．occupied |
Some people said _____ that Copenhagen Conference 2009 didn’t reach any official agreement.
| A．what was a pity | B．what a pity it was |
| C．how pity was it | D．it was what a pity |
Only when you ____
__ what you have learned to practice ______ say you have made it.
| A．adapt; you can | B．apply; can you | C．use; you can | D．adopt; can you |