Use the verbs with or withiut to or V+ing to complete

Use the verbs with or withiut to or V+ing to complete the sentences.
1.I have never seen them (sleep) out.
2.I heard them (discuss) the greenhouse effect yesterday.
3.Let him (look) at this bird carefully and (name) it.
4.Don't let them (join) the union.
5.The tourists expected the weather (be) good.
6.We wouldn't like their team (win) ours.
7.I heard him (ask) the students about the test.
8.I want you (know) more about politict.
9.Nobody expected him (take part) in the official ceremony.
10.The pupils' answers мейд the old teacher (be) happy.