9.I ________ stay at home because my mother wants me to help her do housework.
have to
has to
doesn't have to
don’t have to

have to là phải

câu có nghĩa là tôi phải về nhà vì mẹ tôi muốn tôi giúp mẹ làm việc nhà
10.What would you like ________?t
eat
eating
eats
to eat

theo cấu trúc What + would + S + like + to  + V
11.Many years ago, people wrote letters on paper, ________ now we write text messages.
but
instead
or
then

Đây là 2 mệnh đề trái ngược phải dùng but

12.My mother goes to the farmers' market on the first day of every month. She goes to the farmers' market __________ .
once a week
twice a month
once a month
twice a week