Where’s David?—He ______ be in the playground because he is fond of playing basketball.

Lucy, let me __________ a look at your new watch.—Ok, dad.

Look, Mr Green is on the other side of the street. — It _____ be him.He has gone to London on business.

The poor woman is very worried——_________little food for______ many children.

Do you know whether scientists have ________a good way to deal with Influenza H7N9 or not?—Not yet .But they’re trying their best.