参考答案：
一、1.that, were 2.that, travels 3.that, would be 4.if/whether they can speak 5.if/whether, are playing 6.if/whether he had finished his 7. how many people you can see 8.where she parked 9.what he, talked 10.who knocked 11.if/whether, lives 12.his name was 14.if/whether, wanted 15.if/whether, was
二、1—5: DDDBB 6—10:ACDBC 11—15:CCBAD 16—20:BCDAC 21—25:DACCA 26—30:DCCBA
三、1.why 2.who 3.that 4.how 5.how soon 6.whether 7.whether 8.what 9.why 10.what
四、1.if/whether he wanted 2.don’t think, is 3.which trousers she can 4.how to get 5.will they
五、1.will go 2.was 3. is 4.would 5.swam 6.works
7.had finished 8.hike 9.helped 10.to go