renamed 
does not like 
was reconstructed 
do not usually go 
is made 
have ever tried 
has increased 
will you take
was used 
taking

51. to speak -> speaking

52. informations -> information (information là uncountable noun)

53. my -> mine

54. many -> much (time là uncountable noun)

55. three -> third

56. to

57. up (look up: tra từ điển)

58. after (name after: đc đặt tên theo..)

59. on (put on weight: tăng cân)

60. down (sound down: buồn)

very good! ⚡

\(a,=-17+91-91+17+2011=\left(-17+17\right)+\left(91-91\right)+2011\)

\(=0+0+2011=2011\)

b)\(=\dfrac{4}{7}+\dfrac{1}{6}-0,375.4=\dfrac{31}{42}-\dfrac{3}{2}=-\dfrac{16}{21}\)

\(b)\) \(\dfrac{4}{7}\) + \(\dfrac{5}{6}\) : \(5\) \(- 0,375 .(-2)\)²\(=\) \(\dfrac{4}{7}\) + \(\dfrac{1}{6}\) - \(0,375\) . \(4\)

= \(\dfrac{4}{7}\) + \(\dfrac{1}{6}\) - \(\dfrac{3}{2}\) = \(\dfrac{4.6}{42}\) +  \(\dfrac{1.7}{42}\) - \(\dfrac{3.21}{42}\) = \(-\)\(\dfrac{16}{21}\)

been=>x

for=>since

leave=>to leave

have=>had

was written=>wrote

falls=>fell

does=>didn't

here=>there

will=>would

this=>that

a bottle of water
a dozen eggs
a bowl of noodles 
a glass of milk
a box of chocolate 
a can of soda
a packet of tea
a cup of coffee
a slice of pizza
a tin of tuna
 mik ko bik là có đúng hay ko nữa

few people => fewer people

are => is

Ours => Our

hadn't => didn't

to => from

for => since

dangerous => dangerously

too => either

with => as

perform => performing

nón lá, đầu bút chì, kem ốc quế,...

+Kim tự tháp 

+đầu tên lửa

+ nón lá

Nón lá, mũ sinh nhật, cọc tiêu nhựa

Kẻ đường thẳng t qua O song song với Ac

=> \(\widehat{tOA}=\widehat{CAO}=30^o\) (so le trong)

Ta có: a // b (gt)

\(\Rightarrow\widehat{tOB}=\widehat{OBD}=60^o\) (so le trong)

=> \(\widehat{x}=\widehat{AOt}+\widehat{BOt}=60^o+30^o=90^o\)