We must ___there quickly A.to walk B.walk C.walk to D.walking

We must ___there quickly A.to walk B.walk C.walk to D.walking We must I think we can go there by underground .(改为否定句) I ___ think we ___ ___there by underground We must value what we We must ( )(work)hard. we must call the We must help them? we must help it why we must sleep We must learn it we must find a We must purify the how is the ___there we found___ ___ ___ ___ ___ the museum.we ___ ___ ___there again___ ___.我们发现参观博物馆很有趣,我们决定下次再去那里. “we must study them.是“we must study them. we must keep our classroom( ). we must ( ) our school nuiforms ( we must start tomorrow morning.