Trên tia Ox lấy ba điểm A, B, C sao cho $ OA < OB < OC $ . Từ một điểm M ở ngoài đường thẳng chứa Ox vẽ các tia MO, MA, MB, MC. Giả sử $ \widehat{OMC}={{120}^{0}};\widehat{OMA}={{30}^{0}};\widehat{AMB}={{50}^{0}}. $ Tính số đo góc BMC.
A.$ \widehat{BMC}={{70}^{0}}. $
B.$ \widehat{BMC}={{50}^{0}}. $
C.$ \widehat{BMC}={{60}^{0}}. $
D.$ \widehat{BMC}={{40}^{0}}. $

Choose the answer among A, B, C, D to complete each of the sentences below:
Man has witnessed a great many significant ______ of science and technology in the past few decades.
A.achievements
B.achieved
C.achieves
D.achievers

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Your friendship should be based on ________ trust.
A.blind
B.fragile
C.basic
D.mutual

Choose the answer among A, B, C, D to complete each of the sentences below:
The world’s coal _______ should last longer but, once used, these cannot be renewed.
A.reserves
B.stores
C.storage
D.reservations

Choose the answer among A, B, C, D to complete each of the sentences below:
We live in an age of rapid scientific and technological _____.
A.advancement
B.advancing
C.advance
D.advances

Choose the answer among A, B, C, D to complete each of the sentences below:
I've got lots of ________, but only a few are really good friends
A.close friends
B.partners
C.neighbors
D.acquaintances

Choose the answer among A, B, C, D to complete each of the sentences below:
I hate camping because I can't ______ an umbrella tent in the wind and I can't make a fire in the rain.
A.set off
B.turn round
C.put up
D.take over

Choose the answer among A, B, C, D to complete each of the sentences below:
There is an enormous range of holiday courses on ______ in the summer.
A.suggestion
B.offer
C.advice
D.demand

Choose the answer among A, B, C, D to complete each of the sentences below:
Children are always ______ about Tet holiday.
A.keen
B.concerned
C.excited
D.interested

Choose the answer among A, B, C, D to complete each of the sentences below:
The Great Pyramid was only ______ in height in the nineteenth century AD.
A.proposed
B.improved
C.promoted
D.surpassed