Has Yang Liping returned from Yunnan yet? I’d like to meet her.— SorryShe ____ back here only for last weekend

It is really fun to hike and I often go hiking in the forest.–But hiking alone in the forest ______ be very dangerous.

Do you think it’s a good idea to make friends with your students? —- _____ , I doI think it’s a great idea

Tom, wait a minute— What for? — Take an umbrella _____ it rains

The smoke from the factory made us feel sick. Which of the following is correct for the underlined word