Identify the error in each sentence. Write the corresponding letter A, B, C or D on the answer sheet.
The children forgot picking up the note from the office and now they are worried.
A. picking
B. note
C. now
D. are
Chọn A
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The changes possible caused by the cell phones are mainly concerned with______.
Complete the following sentences by choosing the correct answer among four options (A, B, C or D).