Fill in : some,any,no,every or their compounds:
Eg: Ron knows everything there is to know about computer.
1 They looked........................for Helen but they couldn't find her.
2 .............................is wondering why ..........................noticed....................before.
3 I want to go .....................this weekend.I haven't been .....................for ages.
4 Has .....................seen my pen? I have looked for it........................but it's .....................to be found.