Smoking too much may ______ lung cancer and cause other diseases.
| A．devote to | B．attend to |
| C．contribute to | D．come to |
Do you practice ______ English every morning?
| A．speak | B．to speak | C．speaking | D．spoken |
----Boys and girls, will you please ____ the park this afternoon? ----OK.
| A．not cleaning out | B．not to clean out | C．to clean up | D．clean up |
--Excuse me, sir. Look at the sign on the wall “NO ____”.
--Oh, I’m sorry. I’ll never do it again.
| A．PARKED | B．SMOKE | C．SPITTING | D．SMOKED |
John asked David how ____ Christmas.
| A．celebrating | B．to celebrate | C．to be celebrated | D．celebrate |
Sally had no pen ____ yesterday morning.
| A．to write | B．to write with | C．writing | D．writing with |