The flowers in the garden smell ____.

 The loss of ability in the mother tongue is mainly caused by the         use of electronic devices and a lack of attention to culture.

Chen Yifei(1946－2005)，who died in his ________ fifties，was ________ successful artist.

 My parents want me to take ______ maths lessons at the weekend, but I want to relax myself.

 Whenever a patient needs an injection of Penicillin, the doctor does need to make sure whether his patient is ___ to the medicine.