we know ___ travels not so fast as light.A.sound B.sounds C.the sounds D.a sound选哪个,为什么?

we know sound travels very we know ___ travels not so fast as light.A.sound B.sounds C.the sounds D.a sound选哪个,为什么? 同义句转换：Whose bike it is?We don't know.We don't know ___ ___ ___ ___. he often travels ___ the summer vacation He often travels by plane.同义句He often travels ___ ___. she is new here,so we know ___ about her. Take it easy .We'll know the ___ result soon 一条英语选择题,关于travel的we are know the moon___round the sun A.traveled .B.traveling C.travel D.travels We'll know where we will come next time.同义句We'll know ___ ____ ___next time. 我们都知道足够的睡眠有益于学习.We all know that ___ ___ is ___ ___ study. We ___ already __(know) that scientists ___(find) life on other planets. When shall we meet?I do not know(合为一句) I do not know ___ ___ meet 1.as we all know,reading and writing are two different skills.as we all know,reading skills ___ ___ writing skills . My uncie travels ___ every year.He travels for his business.A.very B.better C.lots of D.much we don't know when we will have the school trip = we don't know when ___ ___the school trip We'll try our best to save ___ animals A danger Bdangerous C endanger D endangeredOur physics teacher told us light ____ faster than sound last termA travels Btravel Ctravelled D travelling 我们知道昆明一年四季都很暖和we know the weather is warm ___ ___ round in kunming We call identical twins ___.填clone.还是 cloned.He did not know ___(exact) what to do about it.