It was 1897________ a European chemist called Dr. Felix Hoffman produced aspirin from this chemical.
A. that B. while C. when D. in which
The famous writer often says that he ________ so much without the support and encouragement from his wife.
A. shouldn’t achieve
B. shouldn’t have achieved
C. couldn’t achieve
D. couldn’t have achieved
When you are ________ in a book or simply trying to rest, the phone always seems to be ringing, ________ whatever peace you might have.
A. absorbed; destroying B. absorbing; destroyed
C. lost; damaging D. losing; damaged
Nowadays, Chinese acupuncture has become popular round the world, __________ have other traditional Chinese medicines.
A. so B. as C. while D. like
The government has been under growing pressure to __________ the causes of air pollution as smog frequently cover over the country’s large cities.
A. release B. schedule C. address D. maintain
__________ from the people and the world, the boy eventually __________ heavy internet user with some mental problems.
A. Withdrawn, became B. Withdrawn, turned
C. Withdrawing, became a D. Withdrawing, turned a
