259-This painting is going to be exhibited at the art gallery.
260-The man is being questioned at the police station at the moment.
268-He is being operated on at the moment.
275-Can you introduce yourself, please?
276-Please help yourself to more tea.
274-The job itself is good but the boss is unkind
280-They live in a detached house. They don't have any close neighbours.
281-The block of flats where he lives has eight storeys.
283-Having been given the first prize, he invited all his friends to lunch
282-It ' s the best book I've ever read.
285-We had an alarm system installed in our house.
287-Having being interviewed for two hours, she was accepted for the job.
288-He disguised himself so as not to be recognized by the police.
290-The demand for oil this month has exceeded supply.
293-We need to buy some.
294-Plants are the main source of natural oxygen
295-In the past, people couldn't find clean water, so there were a lot of diseases.
296-She's been trying to pass her driving test for six years and she's finally managed to pass it.
300-We couldn't get into our car because our keys were trapped inside
291-The plane reduced speed as it approached the airport
267-They were arrested at the airport last week