I’m sorry to tell you that we decided __________ your plan.
A．to abandon B．abandoning C．to quit D．quitting
They are going to find a new approach ______these complex problems.
A．to solving B．to solve C．in solving D．solves
I'm afraid that I can't make myself _______ because of my poor English.
A．understand B．understanding C．to understand D．understood
That dog ought to be destroyed ______ it attacks any more children.
A．until B．since C．after D．before
The library needs __________, but it’ll have to wait until Sunday.
A．cleaning B．be cleaned C．clean D．being cleaned
The 1930s __________ the suffering of the Chinese from war.
A．wrote B．witnessed C．proved D．supplied
