The police _______ the stolen jewellery and returnedit to the owner

The sky is clouding over；we can see there ________ a rainstorm

Many young adults find it hard to make their own decisions.—Well, they have to choose and be responsible for their actions.

Liu Ming is said abroadfor one year before he came to teach in our school．

Some researchers believe that there is no doubt______a cure for AIDS will be found.