英语句子转换2大神们帮帮忙Rewrite the following sentences in the forms of

英语句子转换2大神们帮帮忙
Rewrite the following sentences in the forms of infinitive. 1. There are still a lot of difficulties we have to overcome. 2. Before the machines leave the factory, there is a series of tests that must be passed. 3. At the end of the speech he expressed the desire that he should come and work in China someday. __________________________________________________________________________ 4. They signed an agreement that they should expand the trade between the two countries. __________________________________________________________________________ 5. The commander gave orders that we should cross the river. __________________________________________________________________________