5

a was

b wash

c cleaned

d didn't have

e brush/forgot

4

4.

a) Hoa brushes her teeth twice a day.

b) She forgot to brush her teeth yesterday.

c) Last week the doctor filled a cavity in my eighth tooth.

d) We usually wash and iron our clothes every week.

e) Nga brushes her teeth three times a day.

5. 

a) My father was in Ha Noi three weeks ago. 

b) We always wash our hands before meals.

c) Ba cleaned and tidied his room yesterday afternoon.

d) Lan didn't have a health examination last month.

e) I brush my teeth every night. But last night I forgot to brush them.

CHÚC BẠN HỌC TỐT!