----Goldfish don’t know __________ to them three seconds ago.----Really? It’s so amazing!
To be a good teacher, you ___ be able to hold the attention and interest of your students.
Bobby didn’t have dinner ___he finished designing the plans.
During the summer holidays, the girl practised ___ the piano for three hours every day.
Nowadays most of the Chinese have decided ____ a trip to Malaysia.
The students ___ to check the answers by discussing with others just now.