1. If it doesn't rain, we will go out for a walk.

2. Unless he works hard, he will earn nothing.

3. That they produced that device would be announced the following year.

     ( That + clause + v số it +.....: việc mà ......)

1. If it does not rain, we will go out for a walk.

2. Unless he works hard, he will earn nothing. 

3. They announced that the device would be produced that following year.

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There are several things that we should do to reduce the negative impact of travelling on the environment. Firstly, we should reduce our carbon footprint during the trip. We should only fly when the trip is long and choose environmentally-friendly means of transport such as cycling or public transport. Secondly, wherever we go, we should always protect our environment. By keeping it clean and safe, we can reduce the negative impact of travelling on the environment.