Living in the central Australia desert has its problem, _____ obtaining fresh water isn’t the least.

Can you say something about Wenchuan earthquake (汶川地震)?—___________ people lost their lives in it.

Yesterday evening, I _____ along the street when I suddenly met my maths teacher.

Mrs Green are very grateful to the neighbour _____ helped her child out of the fire．

Can we find before an earthquake?—-Yes. Some animals will run wildly and some plants will come out in the wrong season.