课时作业(一) [必修1 Unit 1 Friendship]
(限时：35分钟)
Ⅰ.单项填空
1．________ about the student，the teacher called his parents to find out why he was so often absent from class.
A．Concerning B．Concern
C．Concerned D．To concern
2．With a lot of difficult problems ________， the manager felt like a cat on hot bricks.
A．to settle B．settling
C．settled D．being settled
3．As the quality of the city's air continues to give rise to ________， the residents are encouraged to set off fewer fireworks.
A．concerns B．compromise
C．descriptions D．emergency
4．The police asked him to ________ what he had seen in a report.
A．look for B．take in
C．give up D．set down
