Present perfect или present perfect continuous
I can’t open the door. It seems to me I (to lose) my key. I wonder if anything (to happen) to Chris. This woman (to live) next door for quite a long time. Why you (not to bring) me the letters for signature? you (to paint) the whole day.

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We always hear many students complain about having to study math or chemistry, even when they don't want to become a doctor or an engeneer. And it's possible to understand, it is actually true, the majority of the students won't even use math in the future. however, it is still important to study compulsory subjects. First of all, there are thousands of jobs that require knowing mathematics, even the final exam mark will matter to a college or the university you'll apply to. Actually, everyone uses math whether they realize it or not. In our everyday life we count in stores to find out how much something costs, and in the future things like that will stay important as well. Math helps us with other subjects, like physics and chemistry. A lot of math problems help the students to solve tasks in physics. 

The Thames is not a long river. It is three hundred and thirty kilometres long and it runs into the sea. The English people call it “the Father of London”. London began on the Thames. When we go in a ship up the Thames we pass under London Bridge, the Tower Bridge and others. There is a museum of old ships on the Thames. These ships are from the history of Great Britain. One of these ships, the “Discovery”, went to the South Pole in 1901 — 1904.
If we go down the Thames we pass the port of London and get to Greenwich — a very old town. We can see the place where the Greenwich Meridian passes.