He feels like the Internet day and night. Tell him not to do it again.
| A．search | B．to search | C．searching | D．searches |
He didn’t know __________
| A．what kind of snake it is | B．what kind of snake is it |
| C．what kind of snake it was | D．what kind of snake was it |
Let’s stop _______ a rest. I am so tired.
| A．having | B．to have | C．having | D．had |
We must do everything what we can _______ water and paper.
| A．save | B．saving | C．to save | D．saved |
My sister got a beautiful present on her ________ birthday.
| A．fiveth | B．five | C．the fifth | D．fifth |
It's a good idea ______ breakfast every day.
| A．had | B．have | C．has | D．to have |