—_____ swim in the river?
— oh, no. Our teacher told us ____ here. It’s dangerous.
| A．Why don’t; not swim | B．Why not; not to swim |
| C．Why not; don’t swim | D．Why don’t; don’t swim |
The river is very deep. My mother warns me _________ in it.
| A．swim | B．not to swim |
| C．to swim | D．not swim |
She hardly ever speaks English because she is afraid ________ mistakes _______grammar.
| A．to make, of | B．to make, on |
| C．of making, at | D．of making, in |
I don’t know ______ he will be back ______ the Dragon Boat Festival.
| A．whether, on | B．if, in |
| C．whether, in | D．that, at |
---Have they finished ________ the Water Festival? ---No, they haven’t.
| A．celebrate | B．celebrated |
| C．celebrating | D．celebration |
---Excuse me. Do you know these English words? ---Sorry, I don’t. But you can __________ in a dictionary.
| A．look it up | B．look up it |
| C．look them up | D．look up them |