Dr Yuan Longping grows _____ is called super hybrid rice, _____ has a high output.

There _______ a pen on the desk. It is a black pen.

Attention! ________ in the form right now, making sure that every detail supplied is accurate.

The population in our country______ very ______. 80% of the population ______ farmers.[ ]

I wonder why Jack always gets good marks when he doesonly ________ the others