Visitors to the National Museum can avoid long lines at the ticket booths by purchasing tickets ____.
We have to work hard; ______ we’ll lose the chance.
We ______ for one hour and a half and it is about time we ______ a rest.
They would not allow him _______ climbing Mount Everest.
This is a mobile phone. It can be used as a small TV, too.
good and sweet, this kind of pear was soon sold out in the market.