Excuseme,butcanyoutellme________?

It’s ______ for us to learn the instrument, because it’s useful.

The boy is ______ my sister, so he sits in front of her.

下列句中，加点词的古义与今义比较，判断正确的一项是①较秦之所得，与战胜而得者，其实百倍　②今日割五城……然后得一夕安寝　③至于颠覆，理固宜然　④且燕赵处秦革灭殆尽之际，可谓智力孤危　⑤其势弱于秦，而犹有可以不赂而胜之之势　⑥下而从六国破亡之故事⑦于是秦人拱手而取西河之外

Look! I found a wallet in the classroom—You should give it to its .He must be upset about losing it.