Khi ta chải đầu bằng lược nhựa, lược nhựa và tóc cọ xát vào nhau, cả lược nhựa và tóc đều bị nhiễm điện. Do đó, tóc bị lược nhựa hút kéo thẳng ra.

Remember to invite other people to share the meal _______ you before you start eating it.

A. with

B. of 

C. to

D. about

There are some tips to save power which I think are very easy to apply. Firstly, we should use energy saving light bulbs in our house. It will help us to reduce our electricity bill. Secondly, we should use public transport if we need to go long distance. We can use bicycles for short distances. I think it is good for our health and economical. And remember, before going to bed, we should turn off all lights and other unused electrical devices. It's an easy way to save our planet. Bài dịch: Có một số mẹo để tiết kiệm năng lượng tớ nghĩ là rất dễ áp dụng. Đầu tiên chúng ta nên sử dụng bóng đèn tiêu thụ ít năng lượng trong gia đình. Nó sẽ giúp chúng ta giảm hóa đơn tiền điện. Thứ hai chúng ta nên sử dụng phương tiện giao thông công cộng nếu chúng ta đi khoảng cách xa. Chúng ta có thể sử dụng xe đạp cho các khoảng cách ngắn. Tớ nghĩ điều đó rất tốt cho sức khỏe của chúng ta và tiết kiệm tiền. Và hãy nhớ trước khi đi ngủ, chúng ta nên tắt tất cả bóng đèn và các thiết bị điện không sử dụng. Đó là một cách rất đơn giản đế cứu trái đất của chúng ta.

_______of all the staff, I would like to wish you a happy retirement.

A. In place

B. On account

C. Instead

D. On behalf

Nowaday, traffic problem is the biggest problem that many people care about. In VN, I think the city where have the worst traffic is Ha noi.
The first problem is the traffic jam here. Why? In the rush hours of the day, there're too many people using the road. Last year, in 2013, many bridges was built so it happen less but in order to stop this, a kind of small car should be invented, people should go to works by buses instead of going by motorbikes...
The second one, as you know, the roads in VN is not as big and clean as the roads in the big countries. They're narrow, bumpy and some dirty so it’s really hard for the road users to drive safely. I think we should raise money to make the road in VN better and better.
But everyone knows that Vietnamese people are not respect and don’t follow the traffic rules. That’s the biggest reason for everything. They wear the helmet that not strong enough to keep they safe if the accident may happen, they ride too fast on the small roads… The traffic will never can be improve if they keep doing this.
At the end, I hope the traffic in VN will improve more.

Nowaday, traffic problem is the biggest problem that many people care about. In VN, I think the city where have the worst traffic is Ha noi.
The first problem is the traffic jam here. Why? In the rush hours of the day, there're too many people using the road. Last year, in 2013, many bridges was built so it happen less but in order to stop this, a kind of small car should be invented, people should go to works by buses instead of going by motorbikes...
The second one, as you know, the roads in VN is not as big and clean as the roads in the big countries. They're narrow, bumpy and some dirty so it’s really hard for the road users to drive safely. I think we should raise money to make the road in VN better and better.
But everyone knows that Vietnamese people are not respect and don’t follow the traffic rules. That’s the biggest reason for everything. They wear the helmet that not strong enough to keep they safe if the accident may happen, they ride too fast on the small roads… The traffic will never can be improve if they keep doing this.
At the end, I hope the traffic in VN will improve more.

Nowaday, traffic problem is the biggest problem that many people care about. In VN, I think the city where have the worst traffic is Ha noi.
The first problem is the traffic jam here. Why? In the rush hours of the day, there're too many people using the road. Last year, in 2013, many bridges was built so it happen less but in order to stop this, a kind of small car should be invented, people should go to works by buses instead of going by motorbikes...
The second one, as you know, the roads in VN is not as big and clean as the roads in the big countries. They're narrow, bumpy and some dirty so it’s really hard for the road users to drive safely. I think we should raise money to make the road in VN better and better.
But everyone knows that Vietnamese people are not respect and don’t follow the traffic rules. That’s the biggest reason for everything. They wear the helmet that not strong enough to keep they safe if the accident may happen, they ride too fast on the small roads… The traffic will never can be improve if they keep doing this.
At the end, I hope the traffic in VN will improve more.