Trong mặt phẳng ( $ \alpha $ ) cho tứ giác $ ABCD $ có các cặp cạnh đối không song song và điểm $ S\notin (\alpha ). $ $ O=AC\cap BD $ . $ I=AB\cap CD $ . Giao tuyến giữa ( $ SAD)~v\grave a ~(SBC $ ) là
A.$ SI $.
B.$ SF $ (Với $ F=AD\cap BC $ ).
C.$ \Delta $ (Với $ \Delta $ đi qua $ S v\grave a //\left( ABCD \right) $ ).
D.$ SO $.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
According to this newspaper, John is said  _______ a new record for the long jump.
A.establishing
B.established
C.to establish
D.to have established

Hai đường chéo hình thoi ABCD có độ dài là $BD=16 cm$ và $AC=12 cm$. Chu vi hình thoi bằng
A.$ 40cm $.
B.$ 60cm $.
C.$ 20cm $.
D.$ 100cm $.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Today, many serious childhood diseases ______ by early immunization.
A.prevent
B.are preventing
C.can be prevented
D.can prevent

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Her boyfriend is said _________ in the army two years ago.
A.have served
B.to serve
C.to have served
D.serving

Choose the best answer to complete the following question.
Ted ______ by a bee while he was sitting in the garden.
A.gets stung
B.got stung
C.get stung
D.got sting

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Her fiancé is said ________ from Harvard University five years ago.
A.having graduated
B.being graduated
C.to be graduated
D.to have graduated

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The dress is a little big for you.You’d better go to tailor’s and _______ at the waist.
A.make it less wide
B.have it made less wide
C.make it wider
D.have it made wider

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Gordon wants to look his best at the wedding so he’s __________.
A.make a suit
B.having made a suit
C.to get made a suit
D.having a suit made

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
It is imperative that your face book password ________ confidential.
A.needed keeping
B.needs to be kept
C.need to keep
D.need keeping