to 四级六级

Dentists advise their patients to brush and floss regularly to prevent their teeth from decaying.

牙医建议他们的病人定期刷牙并用洁牙线剔牙，以防止蛀牙。

Several small businesses consolidated to form a large powerful company.

几家小企业合并成了一家实力雄厚的大型公司。

The businessman was sent to prison for trying to corrupt a tax official with money.

那个商人因企图税务官员行贿而被判入狱。

Saunders stood stolidly to attention .

桑德斯笔直地立正。

The boss put Cage to the door.

老板凯奇辞退了。

She brought the car to a standstill.

她汽车停了下来。

The house was burnt down to ashes.

房子被烧成了灰烬。

He fastened the calendar to a wall.

他日历挂在墙上。

He is in bondage to his ambition.

他被他的野心所支配。

A siege often brings them to terms.

围攻常迫使他们接受条件。

He affixed his signature to the document.

他在那份文件上签了名。

This remark caused affront to many people.

这句话得罪了不少人。

He affixed the sign to the wall.

他将标记贴到墙上。

The policeman alerted me to the danger.

警察警告我有危险。

The patient had an allergy to penicillin.

该患者素过敏。

Stamens 5 to many, adnate with perigone.

雄蕊5到很多，贴生于花被。

He acted as secretary to the board.

他充任委员会的秘书。

Five and eleven add up to sixteen.

5加11是16。

He ascribed his failure to objective conditions.

他失败归咎于客观条件。

He ascribed his failure to bad luck.

他失败归咎于运气不好。