Yesterday Kitty’s teacher Mr Wu invited me ______ their school trip to the World Park.

Children under six are not __________to school except those of extraordinary intelligence.

All the books donated by the students from urban schools are said ________ to the students in the earthquake-stricken areas the other day.

Jack is funny. He often tells jokes to make us _____.

I do some explanations I________ to call on you yesterday,but someone came to see me justwhen I was about to leave