He lives in a large tent, which is easy to put up and take (a)   .

Yesterday, they had a quarrel. Lisa was very angry (a)   May.

We should not have a shower (a)   too long.

People shouldn’t throw (a)   their rubbish into the rivers.

Remember to turn (a)   the lights when you go out.

We can reduce the amount of greenhouse gases (a)   reducing, reusing and recycling.

Global warming is a serious problem (a)   people.

Kate was (a)   holiday yesterday.

People can donate old clothes and toys (a)   charity shops.

The dog barks (a)   me fiercely.

We should not do anything that is bad (a)   the environment.

The melting ice causes floods in many parts (a)   the world.

In order to save the Earth, we should bring our own bags (a)   us when we go shopping.

There are lots (a)   traditional festivals in Hong Kong such as Chinese New Year, Mid-Autumn Festival and Dragon Boat Festival.