6 It's almost ___B_ that he'll be elected chairman of the Students'   Union.

A sure B certain

C positive D

7 No one dares to come close to the mysterious object as it gives __D___ a   terrible smell.

A up B in

C out D off

8 ____A__ their small age， these children did a good job in the   experiment.

A Given B Giving

C To Give D Give

9 He felt life meaningless， for there is nothing he can go _D___.

A down B up

C by D after

10 The manufacturer must ____C_ the quality of products.

A convince B appoint

C guarantee D assure