.
My hometown,_______ I spent my happy childhood, has changed a lot.
| A．when | B．where | C．which | D．since |
It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.
| A．to have played | B．playing | C．played | D．having played |
____ he’s only been learning English for a year, he speaks it very well.
| A．Considered | B．Considering |
| C．Having considered | D．To consider |
--- I hear Warren _____ in a middle school.
--- What? I can’t imagine him _____ as a teacher.
| A．teaches; working | B．teaches; work |
| C．teach; to work | D．teach; working |
The 18-storeyed building, when _____, will shut out the sun _____ up the rooms in my house.
| A．completed; lighted | B．completing; lighting |
| C．completing; lighted | D．completed; lighting |
_____ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.
| A．Tiring; to admire | B．Being tired; admiring |
| C．Tired; to admire | D．Tired; admiring |