Did ______ on time make the teacher angry ?

Measures must be taken to prevent pollution ________ happily.

_______ to carry out the plan in time, they will make careful preparations.

I never thought of it before, _______ all that my parents had done for me for granted.

Upon ________ his studies, he started travelling in China.

Daniel has his arms ______ and looks upset.

Now I regret ______ those weight-loss pills.

____the problem, it follows that we must develop a plan of action.

I witnessed the gate of the bank _______ open and many men entering it, but I couldn’t make them out in the darkness.

________by the advances in technology, many farmers have set up wind farms on their land．