This isn’t my sister’s skirt. ______ is blue.

It might have been John _____ bought a present for Mary yesterday.

The teacher propose that Jack ___ maths or physics instead ofEnglish because he was quick at numbers

The fact has worried the people across the world ___________ the earth is becoming warmer and warmer these years.

The pop group S.H.E is said to have been invited to 2013 CCTV Spring Festival Show.— Really? It’s a long time _______ they three performed together on the mainland.