Choose the best option A, B or C.
6. We ............. to Ho Chi Minh city for our last summer vocation.
A. go B. went C. are going
7. If we breathe dirty air, we ............... breathing problem.
A. have B. to have C. will have
8. Tomorrow is Sunday. I ................. go fishing.
A. am B. might not C. might
9. If the weather .............. good, I will go camping with classmates.
A. are B. is C. will be
10. Walking to school will help ................... air pollution.
A. reduce B. reuse C. recycle