The twins are talking about their trip plan. It’s fun to _________ them.

“The answer sheet written with a pencil_____be cancelled,” declared the teacher.[ ]

下列交际用语使用得体的一项是（ ）

As a teacher, we should know all the students’ ____ and weaknesses.

I borrow yourlighter for a minute— Sure, no problem.Actually, you ____ keep it if you want to. I’ve given up smoking.