_______ basic first-aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known |
| C．Knowing | D．Being known |
After working for two years, Tim Martin was ___ as the top manager in charge of the company.
| A．ranked | B．appointed | C．recognized | D．classified |
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 |