It is dangerous to play with the knife. You ______ hurt yourself.
| A．can | B．may | C．must | D．should |
I bought three DVD copies of the film Avatar and now _ is left. Somebody just borrows something and never returns.
| A．none | B．nothing | C．either | D．neither |
This new computer is obviously superior ______ the old one because it has many new functions.
| A．with | B．on | C．at | D．to |
______ strong-minded the teachers are, they should give their students enough time to share their ideas in class.
| A．However | B．Whatever | C．No matter | D．Although |
Ted and his friends established a website offering useful information about thunderstorms ______ similar accidents happening.
| A．prevent | B．preventing | C．to prevent | D．prevented |