— Hi, Johnson, any idea where Susan is ? — It’s class time, so she in the classroom now.
The medicine _____ natural plants.
----- I’m going to the States. ----- How long ______ you ______ in the States?
I don’t think _____ possible to master a foreign language without much memory work.
----- My father will be here tomorrow. ----- Oh, I thought that he _____ today.
She likes playing _____ guitar while her brother is fond of playing _____ football.