1.I think it's time to do something to reduce traffic jams in Vietnam.

2.Mai used to go to school on foot when she was in primary school.

3.There are often traffic jams in the city centre in the rush hour.

4.People in the past didn't use to worry about traffic congestion.

5.It is compulsory to wear a helmet when riding a motorbike in Vietnam.

1. I think it is time to do something to reduce traffic jams in VietNam.

2. Mai used to go to school on foot when she was in primary school.

3. There are often traffic jams in the rush hour in the city centrer.

4. People in the past didn't use to worry about traffic congestion.

5. It's compulsory to wear a helmet when riding a motorbike in VietNam.

` Kẹo`