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.