— Is it good to look up every new word when I come across it in reading?
—No，you _____，because you are likely to guess the meaning from the context,
| A．don't have to | B．shouldn't | C．can't | D．mustn't |
According to a recent U.S. survey, children spent up to 25 hours a week ______ TV.
| A．to watch | B．to watching | C．watching | D．watch |
Progress so far has been very good. ______, we are sure that the project will be completed on time.
| A．However | B．Otherwise | C．Therefore | D．Besides |
Eugene’s never willing to alter any of his opinions. It’s no use ______ with him.
| A．to argue | B．arguing | C．argued | D．having argued |
I regret ______ that we have no news for you.
| A．to say | B．saying | C．to have said | D．having said |
When he saw a little boy ______ in the river, he took off his shirt and jumped into the water.
| A．struggles | B．struggling | C．to struggle | D．struggle |