—Michael, you have ____ a lot of weight recently.—Yes, I was 62 kg a year ago, but now I’m 73 kg.
He has been collecting coins _______ he was seven years old.
She is usually _______. Why did she get ill so suddenly?
Because of Project Hope (希望工程), _______ children have better lives.
––Has your brother ever been to the Sand Lake? ––Yes, he has _______ the Sand Lake many times.
This morning my mother asked me__.