Reading in the sun is ______ to your eyes.
I out of the window and the police after the suspect(嫌疑人).
Please tell me _____ to improve my English.
Liu Yang is the first Chinese woman astronaut ______ has ever traveled in space.
Of the two coats, she’d like to choose the ________ one to save money for a book.
It’s _________ hard problem for the twins that ________ of them can work it out .