1 . She slipped away without him being_____of it.

A．possible

B．aware

C．casual

D．visual

2 . 请根据句意指出下列句子中划线单词的词性与汉语意思。
1. The river becomes a natural boundary between the two countries.
2. He shouldn’t have braked the car abruptly (突然地) on such an icy road.
3. For the past few years, a great number of banks have opened branches in Shanghai, the biggest financial centre in China.
4. I was really surprised to hear the news that such a brilliant star as Michael Phelps should take drugs!
5. It should be broadcast on Saturday and Sunday afternoons so that we students can have the chance to watch it.
6. Computers can help people in different ways. For example, computers help scientists in analyzing data and doing complex calculations.
7. Doctors warn that angry feelings can lead to heart disease, stomach problems, headaches, emotional problems and possibly cancer.
8. Different people have different views about whether it is wise to pay kids with cash for doing housework.
9. The current situation, in a certain degree, may cast a shadow over the future of the talk.
10. Don’t be too casual at work because work is supposed to be taken seriously.

4 . Although he was attracted by the girl in red, he tried to appear ________ as he asked her to dance.

A．casual

B．desperate

C．sceptical

D．typical

6 . In a small study published today in the journal Nature, a US team showed that the approach was ________ and safe, but was successful only in a handful of patients.

A．feasible

B．casual

C．engaging

D．carefree

7 . The teacher asked us to describe our favorite festival and give _______ reasons.

A．current

B．casual

C．specific

D．confusing

8 . 那个穿着随便的男人结果是个著名的作家，他所有的书都是畅销书。

A．It turns out to be that the man in casual clothes is a famous writer, all of whose books are bestsellers.

B．It turned out that the man wearing casual clothes was a famous writer, all his books were bestsellers.

C．The man who is wearing casual clothes turns out to be a famous writer, all of whose books are bestsellers.

D．The man in casual clothes turned out to be a famous writer, of who all the books were bestsellers.

10 . He tried to sound ________ , but I knew he was worried.

A．usual

B．casual

C．casually

D．usually