The policy of the mainland is very clear and straightforward，and the key problem is ______ the leaders of Taiwan will accept it.
| A．that | B．how | C．why | D．whether |
As simple and convenient way to getLatest fashions online, online shop-ping also hasmajor problem—you can’t see whether they fit or not.
| A．the;the | B．不填；the | C．the;a | D．不填；不填 |
---May I look at the menu for a little while?
--- Of course, _______, sir.
| A．don’t worry | B．it doesn’t matter |
| C．enjoy yourself | D．take your time |
_______ children get older, they become more and more interested in everything.
| A．Once | B．Whether | C．With | D．As |
_______ has been known that ______ other waste found in the ocean, the plastic does not break down.
| A．As; dislike | B．It, unlike |
| C．What, unlike | D．That, dislike |
It is a good plan in theory, but it remains _______ whether it works in practice.
| A．seeing | B．to see | C．seen | D．to be seen |