Jack is _________boy of the twins.

It is the third time that she has won the race，________ has surprised us all.(2012·陕西，14)

The villagers have already known ________ we’ll do is to rebuild the bridge．[ ]

How often do I need to feed the birds—They ________ food every day，or they will behungry.

ys, more senior students in the Chinesemainland are applying for admission to universities overseas after graduation.—–________. But studying abroad may cost more.