Put in the prepositions ago, by, before, in, for, during, since, while, till.
1. I got here _ him, almost an hour _ ,I've been waiting for an hour.
2. I haven't seen Julia_ two months, _June. She was away _ the summer.
3. It's almost a year _ you left school. You did nothing _ this time.
4. I last saw Alex the day_ yesterday,I haven't met him_.
5. The book review will be ready _ a fortnight,_ the end of April.
6. Has anybody called me_ the tea break_I was out?
7. You must finish the report _Friday, _the weekend - at the lastest.
- Cannot it wait _next week? - No, you got the task long_.
Of course they looks ugly, but they make useful things such as collecting rubbish. But also this insects have disadvantages too and this disadvantages are really very serious! The mail problem of them it's their ability to spread infections.
In conclusion i want to add that we need to overcome problems which connected with insects, but we mustn't kill them, because insects also make a lot of usefull things for us.