The effect of the medicine on this kind of disease remains ________.
| A．seen | B．to be seen | C．seeing | D．to see |
Dina, for months to find a job as a waitress, finally took a position at a local advertising agency.
| A．struggling | B．struggled |
| C．having struggled | D．to struggle |
John's success has nothing to do with good luck. It is years of hard work has made him what he is today.
| A．why | B．when | C．which | D．that |
This coastal area a national wildlife reserve last year.
| A．was named | B．named | C．is named | D．names |
You buy a gift, but you can if you want to.
| A．must | B．mustn't | C．have to | D．don't have to |
Father goes to the gym with us although he dislikes going there.
| A．hardly | B．seldom | C．sometimes | D．never |