I walked in our garden, ________Tom and Jim were tying a big sign onto one of the trees.

A. which             B. when            C. where                    D. that

I walked into our garden, _______ Tom and Jim were tying a big sign onto one of the trees.

A. which         B. when          C. where         D. that

Some policemen were sent there to ________ the villagers _________ down the trees.

A. keep; cutting     B. prevent; cutting      C. prevent; to cut      D. stop; to cut

In autumn, leaves turn yellow and _________ the trees.

A. fall out             B. fall off             C. fall down            D. fall over

Some policemen were sent there to ______ the villagers ______ down the trees.

A.keep;cutting                                                        B.prevent;cutting

C.prevent;to cut                                               D.stop;to cut