Tom is a ____________person. When we are on holiday, he can look after our pet.
All the universities have duty to _______ their students ____of the quick development of the scientific world.
I _______ spend the Saturday afternoon with my old friends in the zoo, but they did not come.
Reading books is very important for developing the students’ understanding of the world, ____?
Heating the news that my father was ill,I was so worried that I couldn’t on anything.
The reason ______ he gave for not coming was ______ his mother wouldn’t allow him to.