Years ago we didn’t know this, but recent science _______ that people who don’t sleep well soon get ill.
They urged that the library_______ open during the vacation.
The church clock began to _______ twelve.
You should make ______ a rule to leave things______ you can find them easily.
Many people say______ is shown on television.
-----Is this the first time you______ Chengdu? -----No. But the first time I______ here, the city wasn’t so beautiful