The teacher set such difficult problems ______ nobody could work out _____ none of us passed the test.
________ seems that she was not interested in the topic they were talking about.
She devoted herself ________ to her research and it earned her a good reputation in her field.
It is said that Zhangjiajie ________ a visit.
Does the work________ any effect________ your family life?
A red sky in the morning ________ to be a sign of bad weather.