（ ）1.Half of the class _______most of the work .Some of the work ________really difficult.
A.have done ，is B.had ，done C.has done ，is D.have done ，are
( )2.If you are not a basketball fan ，you might find this Sunday's programme _________.
A.a bit little boring B.a little boring C.a bit of boring D,A and B
( )3.Would you please come over again________before you leave.
A,sometimes B.some times C.sometime D.some time
还有一个问题 ，就是sometimes、some times 、sometime 、some time之间的区别是什么吖？他们的意思能否给我解释一下?谢谢了。