expectancy

My father was at the age of sixty when he learnt to swim

1. is waiting

2. is / is reading

3. is flying / is going to land

4. are going to see / will...join

1. He is strong enough to carry that table

2. Alexander Grahambell was the person who invented telephone

3. The front yard isn't large enough to play soccer in

4. Miss Johnson told me to read books regularly

5. I haven't spoken to her for 3 years

Với giá trị nào của tham số m để đồ thị hàm số y = x³ - 3x² + m có hai điểm cực trị A, B thỏa mãn OA = OB (O là gốc tọa độ)?

D. Contains

1. dependent

2. establishment

3. survival

4. orphanage

5. inexpensive