The two companies decided to （ ） on a project concerning animal cloning.

English （ ） in a new way at my college in the past few years.

If I had remembered （ ） the window, the thief would not have got in.

It is （ ） impossible to work with this noise around.

I, _____ your good friend, will try my best to help you out.

He studies so hard to avoid （ ） at the bottom of the class.

I love thinking of new designs. It keeps my mind clear and active and fills my retired life with （ ）.

_____ more time， he’ll make a first-class tennis player sooner or later.

Her sister always spends so much _____ her clothes that she can’t manage to live with her salary.

Only when （ ） in the afternoon （ ） able to leave.

______ , Martin can reach the branch of that tall tree at the gate.

I decide to leave the company next month, where I _____ for exactly three years.