The stone on the river bank rolled under her feet; she was _____into the river,and she called out for help.
Be careful about everything for your carelessness will __________our difficulty.
Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late.
Look over there—there’s a very long, winding path _________ to the house.
It is in Hong Kong _______ you’re going to find the cellphone _________ you have been wanting to buy.
We are all ________ with the natural beauty of Lijiang and decide to visit it again next year.