in trouble，the solution to，at certain times，make sure，feed on，in the last few years，lead to，in search of，cut down，find out

（1）If the American government couldn't deal with the accident properly，it would

lead to

lead to

more violence.
（2）More woods have been

cut down

cut down

in order to build more houses.
（3）

Make sure

Make sure

that you have understand what the teacher said.
（4）The butterflies

feed on

feed on

flowers of different plants.
（5）Try not to make yourself

in trouble

in trouble

because there is going to be an exam tomorrow.
（6）Many changes have taken place in his hometown

in the last few years

in the last few years

．
（7）So far they haven't found

the solution to

the solution to

this problem.
（8）Rescuing workers are digging through the ruins

in search of

in search of

other victims.
（9）He can be really bad tempered

at certain times

at certain times

．
（10）Would you call me as soon as you

find out

find out

where she is？