People say that six out of the seven wonders of the ancient world were destroyed.

A. an impact on teaching quality

B. it difficult for school-leavers to find a job

C. it clear that degrees from Vietnamese universities are not recognized worldwide

D. students feel embarrassed when leaving schools

A. obediently

B. obedient

C. obedience

D. obey

A. knew

B. had known

C. have known

D. would know

A. come out

B. come up

C. brought up

D. brought out

A. last week

B. the previous week

C. the following week

D. next week

A. As soon as it was five years, I had worked for this company.

B. I have been working in this company for five years.

C. I haven't worked for this company for five years.

D. When I worked in this company, I started in five years.

A. at

B. for

C. on

D. in