(1) I did not go to school yesterday. Because I had a fever.
→ I did not go to scool yesterday because I had a fever.
→ I did noto go to school yesterday. I had a fever.
(2) I was late this morning for the heavy traffic.
→ because of / due to / on account of
(3) I caught a cold, probably since I had taken a tepid bath.
(4) I was surprised that how little she knew about the world.
→ surprised (at) how
(5) I am very busy doing housework that I have no time to go to the beauty salon.
（解答）Could [Would] you call me back in ten minutes, becuse [since / as] I'm very busy now?
（別解）Could [Would] you call me back in ten minutes? I'm very busy now.
（解答）I looked up that [the] wprd in the [my] dictionary because I did not know its meaning.
（別解）I did not know the meaning of the word, so I consulted the dictionary.
（解答）I was in such a hurry that I left my umbrella somewhere.
（別解）I left my umbrella somewhere, because I was such in a hurry.
（解答）You can sometimes make friends with even a total stranger just because you happen to be reading the same book as they are.
（別解）When you happen to find someone reading the same book as you are, you can sometimes make friends with them even if you have never met them before.
（解答）Thanks to [Because of / Due to] cloning technology, scientists will probably be able to recreate even dinosaursin thenear future.
（別解）Cloning technology may enable scientists to bring even dinosaurs back to life in a few years.
（解答）There are so many places to see in New York (City). You cannot visit all of them in few days [i two or three days / in a couple days].
（別解）New York has so many things to see that it is impossible for you to get around in the whole city in a few days.
（解答）The number of people commuting [who commute] (to work) by bicycle has increased, probably because people of all ages can ride one (readily / easily) and bicycle are good for their health as well as for the environment.
（別解）More and more commuters are using bicycles. This is probably because anyone can ride one easily regardless of age, and riding a bicycle helps improve their health and is environmentally friendly.
（解答）It is often said [People often say] that Japanese people find it hard [difficult] to improve [to develop] their foreign language skills because they are too embarrassed about not being able to speak (a language) well.
（別解）Japanese people are often said to have difficulty becoming good at speaking foreign languages because they are shy and hesitate to spek\ak.
（解答）We are often surprised (to find out / to discover) how little we know about our coutry whe (we are) asked (something) about it by foreigners.
（別解）When foreigners ask us about our country, we are often surprised (to find out / to discover) how ignorant we are of it.
（解答）Yesterday I was exhausted after [from] (doing) (my) club activities and I fell asleep on the train while reading. I almost missed [nearly missed / almost went past] my station, but a frined from junior high school who happened to be on the same train woke me up.
（別解）Yesterday I fell asleep while reading on the train, because I was exhausted from club activities. I managed to get off at my station, because I was woken up by an old friend from junior high school who happened to be on the same train.
I strongly agree with this system. It may be important for students to study at college, but it is much more important to experience various things around the world that they cannot learn at university. A gap year will give them a wonderful chance to broaden their views. When students graduate from college and get a job, they can hardly take a long vacation, especially in Japan. I addition, students who know a lot about the world and have a broad view will do good work at college or in society. （91語）