完成句子（共5小题10空；每空1分，满分10分）

1. 经济发展也带来了环境问题。

Economic development has also _________   ___________ to environmental problems.

2. 我们应该采取措施来防止地球受污染.

We should __________  _____________  to prevent the earth from being polluted.

3．我们要尽一切办法使他振作起来。

We tried every means to get him to ___________  _____________.

4．他们很穷，但还是设法把儿子送去大学读书。

They were poor, but they__________  ___________ send their son to college.

5. 我为昨天所做的事向你道歉。

I ______________  ____________  you for what I did yesterday.

如图所示的四个图象中，说明物体在作匀速直线运动为（   ）