While you are doing math exercise, put a calculator(计算器) ____ to help you.
| A．in hand | B．at hand | C．by hand | D．on the hand |
—________do you prepare for an exam?
— By going over all my notes.
| A．How | B．Why | C．When | D．Where |
—What’s wrong with you?
—I wasn’t careful enough and _______an old man while walking along the street.
| A．knocked off | B．knocked up |
| C．knocked into | D．knocked out |
—Shall we drink the tea now?
—No, the tea should be ______in the water for some time before you drink it.
| A．stayed | B．staying |
| C．kept | D．keeping |
—I didn’t find my pen yesterday.
—Sorry, I took your pen __________.
| A．in mistake | B．for mistake |
| C．by mistake | D．for mistakes |
We’ll be paid _______the amount of work we do.
| A．including to | B．according to |
| C．thanks to | D．Because |