195. The weather was so bad that we couldn’t go sailing.
 The weather wasn’t _______________________________________________________
196. The plane took off before we arrived at the airport.
 By the time _____________________________________________________________

197. I don’t live in a big city, so I can’t go to the cinema very often.
 If _____________________________________________________________________
198. She never seems to succeed even though she works hard.
 In spite of ______________________________________________________________
199. Jeanie is the tallest girl in her class.
 No one _________________________________________________________________
200. You didn’t plan things at the start, so we are in this mess now.
 If _____________________________________________________________________
201. My father bought a car with a sun roof.
 The car ________________________________________________________________
202. It’s said that English people are quiet and severed.
 English people ___________________________________________________________
203. Fiona had to get on the plane though she was afraid of flying.
 Despite ________________________________________________________________
204. Foxes can use their noses to find their dinners because they have a keen sense of smell.
 Because of ______________________________________________________________
205. He was very old, but he walked ten miles everyday.
 Despite ________________________________________________________________

178. We have lived here for 15 years.  We started ______________________________________________________________ 179. English and French are spoken in Canada.  People _________________________________________________________________ 180. They are going to invite Nam to dinner.  Nam ___________________________________________________________________ 181. I can’t cook as well as my mother does.  My mother ______________________________________________________________ 186. He wrote the letter in two hours.  It _____________________________________________________________________ 187. It was such hot tea that I couldn’t drink it.  The tea _________________________________________________________________ 188. Because she behaves well, everybody loves her.  Because of ______________________________________________________________ 189. Unless you water the flowers everyday, they will die.  If _____________________________________________________________________ 190. I have studied English for 3 years.  I began _________________________________________________________________ 191. She didn’t take your advice, so she failed in the exam.  If _____________________________________________________________________ 192. We spend our childhood in that beautiful mountain resort and we always remember.  We always remember _____________________________________________________ 193. The cake was so bad that I couldn’t eat it.  It’s ____________________________________________________________________ 194. Without a passport, she couldn’t have left the country.  If _____________________________________________________________________

172. The water was so cold that the children could not take a swim.
 The water wasn’t _________________________________________________________
173. It’s two months since I last spoke to her.
 I haven’t _______________________________________________________________
174. “Turn down the radio, Nam.” , his father said.
 Nam’s father ____________________________________________________________
175. Lan will be seventeen next week.
 It’s ____________________________________________________________________
176. How long is it since you bought the car ?
 When __________________________________________________________________
177. Nam began to collect stamps in 2000.
 Nam has _______________________________________________________________

164. It’s a six–hour drive from London to Edinburgh.
 It takes _________________________________________________________________
165. It’s ages since Alan visited his parents.
 Alan ___________________________________________________________________
166. Mr. Will lost his job because he was late every day.
 If _____________________________________________________________________
167. The police made the youth empty his pocket.
 The youth ______________________________________________________________
168. Lawrence hasn’t seen his sister since she left for Japan.
 Lawrence last ___________________________________________________________
169. John is fat because he eats so many chips.
 If _____________________________________________________________________
170. If Joe doesn’t change his way, he will end up in prison.
 Unless _________________________________________________________________
171. Having a vacation abroad is interesting.
 It’s ____________________________________________________________________

164. It’s a six–hour drive from London to Edinburgh.
 It takes _________________________________________________________________
165. It’s ages since Alan visited his parents.
 Alan ___________________________________________________________________
166. Mr. Will lost his job because he was late every day.
 If _____________________________________________________________________
167. The police made the youth empty his pocket.
 The youth ______________________________________________________________
168. Lawrence hasn’t seen his sister since she left for Japan.
 Lawrence last ___________________________________________________________
169. John is fat because he eats so many chips.
 If _____________________________________________________________________
170. If Joe doesn’t change his way, he will end up in prison.
 Unless _________________________________________________________________
171. Having a vacation abroad is interesting.
 It’s ____________________________________________________________________

Cho tam giác ABC điểm M nằm trong tam giác, gọi D, E, F lần lượt là trung điểm các cạnh BC, CA, AB, gọi A', B', C' thứ tự là điểm đối xứng của M qua D, E, F
a, Chứng minh tứ giác AB'A'B là hình bình hành
b, Gọi O là giao điểm của B và B', chứng minh C và C' đối xứng nhau qua điểm O, vẽ hình giúp mình vs

1.Phân tích các đa thức sau thành nhân tử :
a, x^2-7x+5;
b, x^2-9x-10;
c, 2x^2-3x-5;
d, 3x^2+2x-5;
e, 8x^3+12x^2y+6xy^2+y^3;
2. Phân tích các đa thwusc sau thành nhân tử :
a, a^3-a^2x-ay+xy;
b, xy(x+y)+yz(y+z)+xz(x+z)+2xyz
; c, x^4+2x^3+x; d, 4x^4+81y^4

Cho tam giác ABC điểm M nằm trong tam giác, gọi D, E, F lần lượt là trung điểm các cạnh BC, CA, AB, gọi A', B', C' thứ tự là điểm đối xứng của M qua D, E, F
a, Chứng minh tứ giác AB'A'B là hình bình hành
b, Gọi O là giao điểm của B và B', chứng minh C và C' đối xứng nhau qua điểm O