--Excuse me, teacher, can I ask you something about the last class? I didn’t quite understand it.--Sure! Please feel _________to ask me anything!
______ may have a chance to be successful if he tries his best.
You will fall behind the others ______ you start to work hard.
— Excuse me. Is the museum open all day long? — ______ , only from 9:00am to 5:00pm.
The student ______ his homework and handed it to the teacher.
Fruit is good for our health, so I like ______ for dessert.