Rewrite the second sentence so that it has a similar meaning with the first one

People use a lot of vehicles. The air is polluted.

If ____________________________________________________________

The Maori in New Zealand greet each other by __________ their noses.

Choose the best answer A, B, C or D to complete the following sentences

If the factory _________ dumping poison into the lake, all the aquatic animals will die.

When the policeman came to the scene, the driver of the car __________.

By the time I (arrive) ___________ at the airport, my husband (wait) _____________ for me for an hour.

That room (paint) ________________ at this time next week.

Choose the letter A, B, C or D to complete the passage below

Water pollution happens __________ (1) toxic substances enter water bodies such as lakes, rivers, oceans and so on, getting dissolved in them, lying suspended in the water or depositing on the bed. This degrades the quality of water. Not __________ (2) does this spell disaster for aquatic ecosystems, the pollutants also seep through and reach the groundwater, which might end up in our households as contaminated water we use in our daily activities, including drinking.

Water pollution can be __________ (3) in a number of ways, one of the most polluting being city sewage and industrial waste discharge. Indirect sources __________ (4) water pollution include contaminants that enter the water supply from soils or groundwater systems and from the atmosphere via rain.

Question 1:

The air in Hanoi __________, so we should use facemask.