Choose the correct form.
1. We all tried to push the van, but it ________ move.
a) can't b) couldn't c) won't d) wouldn't
2. The idea is that the nation _________ an unmanned spacecraft to explore the planet first.
a) sent b) sends c) send d) must send
3. The management urged that the cost of production __________ .
a) to be further reduced b) was further reduced c) be further reduced
d) should further reduced
4. The business is risky. But ________ we would be rich.
a) should we succeed b) we should succeed
c) might we succeed d) would we succeed
5. His English teacher recommends that he ________ a regular degree program.
a) begins b) begin c) will begin c) is beginning