His explanation can’t be accepted　　　satisfactory.

Yemeni President signed a deal under which he will step down after 33 years in  and 10 months of protests against his rule.

 As you are now a member of our society we shall let you ____ our secrets.

For a long time, he hesitated whether he should tell us ____ what had happened. 

Much ________ my surprise，every student looked at me ________ surprise when I came into the classroom.