— ____ do you do to celebrate Christmas?
—We have a party and give presents to each other.
| A．How | B．Where | C．What | D．When |
The sentence structure（结构）of “Teachers ask me to finish the homework on time” is ____________.
| A．S+V+DO | B．S+V+IO+DO |
| C．S+V+DO+OC | D．S+V+P |
I think ____necessary for us _____the birds.
| A．it , protect | B．its, to protect |
| C．it’s , protecting | D．it , to protect |
Parents ______ good conditions(条件) _______ us. We should be grateful（感激的）to them.
| A．provide, with | B．provide, for |
| C．protect, to | D．protect, for |
I have _____ useful dictionary. Do you have ______?
| A．a, one | B．a, it |
| C．an, that | D．an, one |
About seventy percent of our earth _______ by water.
| A．is covering | B．is covered |
| C．are covered | D．are covering |