一1.The new word is unfamiliar to us.
2.how to
二1.You should have asked what to wear
2.You can't imagine how fast I am improving my English.
3.You shoudn't point your chopsticks at others.
4.As for us,it is the most important thing to spend time with familiy memebers.
5.I am gradually getting used to things in French,feeling no more unfamiliar.