The scientists are studying the effects of human activities______the environment.
— These boxes are too heavy for me to move.— Here, I’ll give you a hand ____ them.
It was not until she had arrived home _____ her appointment with the doctor.
The cruelty of the terrorists towards the two Chinese engineers in Pakistan and _____ of the terrorists towards America in September 11, filled everyone with horror.
— He ought to have been warned of the danger.— ______, but he just wouldn’t listen to me.
The traffic problem we are looking forward to seeing _____ should have attracted the local government’s attention.