1.The spectacular mountain,standing 2,000 meters above _____sea level,is _____home to a fascinating diversity of wildlif

1.The spectacular mountain,standing 2,000 meters above _____sea level,is _____home to a fascinating diversity of wildlife.
A.the;the B.the;a C./;the D/;/
2.While playing computer games ,_____.
A.he heard
B.his father approached
C.his father's footsteps approached
D.his father was very angry
3.-- jerry succeeded in entering his flat without the key._______?
--maybe ,he had asked somebody for help.
A.What for B.So what C.Guess how D.who knows
4.Most teens are smoking in Africa,_____the number of students who pick up this habit has increased a lot.
A.where B.which C.what D.as
5.My father told me that he would have something to say to me _____ dinner.
A.in B.on C.beyond D.over