She used ______ on the right in China, so she was not used _______ on the left in England at first.
—_____will you stay here? —Until tomorrow afternoon.
My shoes are worn out.They need_______.
_______ Andy was playing,his mother came home.
一Look! There is a small bridge on the river. 一It ________ two days ago.
It is said that the gravity on Mars is only about __________ of the gravity on earth.