() 18. The twins looked at each other and kept it a secret  themselves.

   A. to;at   B. as;to   C. for;with   D. as;with

() 17. We will have no water to drink we don' t protect the earth.

   A. until   B. before   C. though   D. if

() 16. Please speak louder I can hear a little better.

   A. though   B. so that   C. such that   D. in order to

() 15. We’ll never give up our plan happens.

   A. however   B. whatever   C. whenever   D. wherever

() 14. Books are made paper while paper is mainly madewood.

   A. of;of   B. from;from   C. of; from   D. from;of

() 13. The little boy is young he can't go to school.

   A. enough;to   B. too;to   C. so;that   D. such;that

() 12. The sweet smell of the flowers in the garden comes in the open windows,making us feel good.

   A. through   B. with   C. on   D. across

() 11. — Where was your brother at this time last night?

—He was writing an e-mail I was watching 1V at home.

   A. as soon as   B. after   C. until   D. while

() 10. My brother is so crazy computer games that he pays no attention anything else.

   A. aboutTfor   B. with;to  

    C. with;for     D. about;to

() 9. Lend your bicycle to him you will not go out this afternoon.

   A. until   B. unless   C. but   D. since