Scientists say they have found a way to produce the human body’s own cancer-killing cells through gene treatment, ____ new hope to cancer sufferers.

----The prices are _____ day by day. It’s hard to make ends meet.(收支相抵)----I hope the terrible situation won’t continue.

At the school gate, you should _____ the safeguard with your student card.

Rod loves ________ clocks. However, he never manages to put them together again.

Don’t forget _______ all the lights when you leave the classroom.