—Must we sweep the floor right now?—No , you ________.You can do it laterA. mustn’tB. can’tC. don’t have to
—When will the train ______ here? —In five minutes.
I usually ______ sunglasses outside in the sun.
The poor girl needs an operation. But it will ________ a lot of money.
It’s impolite __________others. Always wait politely.
---How can we help _________ people? --- We can help them cross the road.