1. While i was sleeping, i dreamt i was flying.

2. We were shocked when we heard the unexpected news.

3. Before my father leaves for work, he usaully drinks a cup of tea.

4. After i finish my homework, i usually watch TV for thirty minutes.

1. She was suprised when she found a golden coin in the garden.

2. As soon as i find my wallet, i will go shopping right after.

3. Before he made a quick phone call to a client, then he left the office.

4. After he mowed the lawn, he took a rest.

a)Ta thấy: 20<30<35<45<50

nên cửa hàng đông khách nhất vào lúc 11h và vắng khách nhất vào lúc9h.

b)ta thấy 30<45

nên số lượt khách đến cửa hàng từ 15h-17h tăng

Số lượt khách đến cửa hàng từ 15h-17 tăng số lượt khách là:

45-30=15 (lượt khách)