New Words：

permission [pərˈmɪʃn] n.许可；批准；准许；许可证

Sample Sentences：

I gave him my permission to leave.
She asked for permission to leave work early.
Who gives you permission to leave class early?

New Words：

permit [pərˈmɪt]
v.允许；准许

Sample Sentences：

Radios are not permitted in the library.
Permit（Allow） me to give you some advice.
Visitors are not permitted to take photographs.
We hope to visit the Great Wall, if time permits.

advice [ədˈvaɪs] n. 建议；意见；忠告；劝告
permission [pərˈmɪʃn] n.许可；批准；准许；许可证

New Words：

at present 目前;现在;眼下;当今

Sample Sentences：

I'm sorry he's out at present.
At present, the world has about 6,800 languages ．
At present children under 14 are not permitted in bars.

permit [pərˈmɪt]
v.允许；准许

New Words：

useful [ˈjuːsfl] adj.有用的；有益的；实用的；有帮助的
helpful [ˈhelpfl] adj. 有用的;有益的;有帮助的

Sample Sentences：

He might be useful to us.
I'm so happy that it'll be useful for you.

The people I spoke to were very helpful.
I called the police but they weren't very helpful.
Is there anything you need to tell me that you think will be helpful?

New Words：

dictionary [ˈdɪkʃəneri] n. 词典;字典

Sample Sentences：

I don't need the dictionary at present.
This new dictionary is very useful [ helpful] to me.
When you do not understand a word, you can look it up in this dictionary.

useful [ˈjuːsfl] adj.有用的；有益的；实用的；有帮助的
helpful [ˈhelpfl] adj. 有用的;有益的;有帮助的
at present 目前;现在;眼下;当今