完形填空。 One day two brothers 1 fishing. They  had  a  dog 2 them. When  they  came near the river, they threw their hats on a big stone and went to the 3 bank to 4 fish. It was cold that day, and soon they began to wish for their hats. They told the dog   to go back for 5 . When the dog 6 there, he tried to take both  hats  together  in  his  mouth. It  was  very  difficult.  Then the dog  noticed one of the hat was smaller than 7 .  He put the smaller hat in the larger one, got it down 8 his foot and then he could 9 both hats at the same time. You see 10 clever the dog was. (     )l. A. goes (     )2. A. for (     )3. A. river (     )4. A. get out (     )5. A. it (     )6. A. arrived at (     )7. A. the other (     )8. A. with (     )9. A. eat (     )10.A. what B. going B. with B. sea . B. look after B. them B. gets B. another B. in B. fish B. what a C. went C. to C. water's C. look for C. him C. got C. the others C. on C. carry C. how D. go D. of D. land's D. wait for D. fish D. got to D. other D. by D. borrow D. how a