--Honey, stay home before I return. ---I _______, mum.
Nowadays scientists are working hard to find out ______ to do with air pollution.
Good teachers can usually give the students______ advice on their study.
Chinese people have been using paper for over______ years.
Mother came into my study with a cup of milk in one of her hands, and an apple in ______.
______ amazing the Disney film Frozen is!