This nature reserve is home to more than eight ________ (百) kinds of animals and plants.
I won't let you in （除非） you can provide a proper ID．
What's in the box？ Let me （猜）． Is it a book？
China's fight against COVID﹣19 gives the world （宝贵的） experience．
The hotel provides delicious food and comfortable rooms， but still some customers complain about its （服务）．
A stranger （主动提出） to give her a ride on the street， but she refused politely．