the system has the ____ to run more than one program at the same time.
         A. knowledge.        B.ability
         C. access               D.recognition
Paper bags have been largely ___ by the plastic bags.
        A.  replaced             B. touched        
        C. original               D.practised 
The teacher gave us an ______ on air pollution.
a. advantage         b. application         
C. assignment     D. ability

1. this is not really suitable reading ____ for a young child.
A. material            B. effect                   C. access            D. pronunciation
2. the experience has had a negative ____ on him
A. record                  B effect                C device                D knowledge
3. Swimming is a very ___ way of staying in shape.
A. portable               B. enjoyable          C qualified            D. high-status

(giải thích giùm mình với ạ)

1. the teacher gave us an ______ on air pollution.
a. advantage         b. application          C. assignment     D. ability
2.paper bags have been largely ___ by the plastic bags.
A. practised          B. replaced             C. original           D. touched

 (giải thích giùm mình luôn ạ)

the system has the ____ to run more than one program at the same time.
A. knowledge.        B. recognition        C. access           D. ability