There has been a sharp increase ______ the number of workers moving to the city recently.

A. how recycling waste helps reduce pollution

B. how to reduce pollution by using waste materials

C. the most useful waste materials in daily life

D. a simple benefit of water pollution

A. Living in Paris encouraged him to take up piano as the first instrument ever learnt.

B. Before moving to Paris, he took up piano as the first instrument ever learnt.

C. Piano was the first instrument he learnt after moving to Paris.

D. He had never learnt any instrument before although he lived in Paris.

A. cost-effective

B. environment friendly

C. disadvantaged

D. environmentally friendly

A. His mother wanted him to be a doctor because he wanted to become a music composer.

B. If his mother wanted him to be a doctor, he wanted to become a music composer.

C. His mother wanted him to be a doctor but he wanted to become a music composer.

D. His mother wanted him to be a doctor so he wanted to become a music composer.

A. die

B. bike

C. live

D. life

A. offer

B. visit

C. respect

D. study