._____from heart trouble for many years, his father has to take some medicine with him wherever he goes.
People try to avoid public transportation delays by using their own cars, and this ____ creates further problems.
After the new technique was introduced, the factory produced_____ cars in 2008 as the year before.
Great changes ______ in China in the past 20 years.
The question is ______ it is worth doing.
---Would you mind my sitting here ____ lunch? ---______. A. and have, No, not at all C. and having, No, thank you. C. to have, Never, go ahead. D. and have, Oh, it’s my pleasure.