(　　)9.Female sheep produce one to five lambs 　　　　. A.at times　　　　B.at one time C.at a time

单项填空　　　　　　　　　　　　
(　　)9.Female sheep produce one to five lambs 　　　　. 
A.at times　　　　B.at one time        C.at a time         D.some times
(　　)10. Linda hardly has any good friends because she always 　　　　to help other people. 
A.receives     B.returns            C.refuses         D.rewards
(　　)11. —　　　　 have you kept in touch with your friends on WeChat? 
—Since three years ago.
A.How far     B.How often         C.How soon     D.How long
(　　)12. —It’s very kind of you to teach me how to make home page. Thank you very much.
—　　　　. 
A.No problem                        B.Don’t thank me
C.You’d better not                    D.You’re welcome

答案.9.C　10.C　11.D　12.D