i think it runs ____ a speed of 100km/h.A.in B.at C.away

i think it runs ____ a speed of 100km/h.A.in B.at C.away 这句话看不懂I think I'll be a doctor ,it sort of runs in the family.就后半句看不懂. i think ____ (watch) tv is much better than it . I think it is right to do that.I ____ think it ____ right to do that A kangaroo runs so fast that can catch up with av train,同义句 A kangaroo runs ____ ____ ____catch up with a train.快啊.我想应该是e.I think it_________ _________e.g It doesn't help ,I think.（合成宾语从句）I ___ think it___ ____. I think it's important to keep the room clean.I think ____ ____ to keep the room clean. I think he can do it.否定句I ____think he ____ do it. I think it will rain this evening.改为否定句____ ____ it ____ rain this evening. I think it my duty to write to you and thank you.(改为复合句)I think it ____ my duty ____ ____ to you and thank you. The sky___(be)black.I think it ___ ___ ____ ____(rain) ____ (who) comb is this It's ____ (she ),I think. 同义句转换.Jack runs faster than I.I ____ run ____ ____ ____Jack. I think it----question---- I think it my duty to write to you and thank you.(改为复合句)I think that it ____ my duty ____ write to you and thank you. Think it over ,I think it's She wants to know ____ a good ideaA、why didn't I think it wasB、why I didn’t think it wasC、why I thought it wasn’tD、why did I think it wasn’t求理由、、、、、 --____?-- Orange,I think.A.What is it B.How is the food C.What colour do you think