1 . The production of television commercials must be professional _____ they aim at promoting good service or public education.

A．however

B．whether

C．although

D．whatever

2 . He spoke in a low voice, ________ he said something to himself.

A．now that

B．in case

C．as if

D．ever since

3 . ________ you’ve set you mind on the goal, you must make every effort to get it achieved in spite of challenges.

A．Now that

B．As if

C．Unless

D．In case

4 . _____ you are a big boy, you should not do things like a baby.

A．As if	B．Now that
C．Before	D．Though

5 . ________ people have been used to the single-use plastic bags, it is unavoidable to throw away this consumption habit to help protect the environment.

A．Because

B．Unless

C．Even though

D．So that

6 . Any academic breakthrough, ________, does not automatically ensure that it can be applied to practice.

A．since it may be brilliant	B．brilliant though it may be
C．how brilliant it may be	D．if it may be brilliant

7 . ________ it is learning in school through computer, relaxing at home with video games and TV or communicating with friends on phones and social media, time spent on screens has become an essential part of modern life.

A．Because

B．While

C．Whether

D．As

8 . ________ our new product hasn’t been accepted by the public, I think its potential market is large.

A．While

B．Unless

C．Once

D．Before

9 . 我们要牢记：只要抓住机遇，终会逆风翻盘。(mind) (汉译英)

10 . 随着世界变得更全球化，我们已经到了掌握一门外语对于年轻人来说是必备技能的地步。(point) （汉译英）