The computer centre, ____ last year , is very popular among the students in this school.
. The government has _______ the parents to work with teachers in the education of their children.
. The plan ___ just because people were unwilling to co-operate(合作)。
. My study of biology has ___C___ much of my spare time, but it has given me a great deal of enjoyment.
. Elephants would ______ if men were allowed to shoot as many as they wished.
. I had to ______ because someone else wanted to use the phone.