—Sorry I’m late.I got stuck in traffic.—___.You’re here now.Come in and sit down.
So difficult ________ it to live in an English-speaking country that I determine to learn English well.
The medicine is supposed to cure this disease, but I’m not sure it.
----No one is so ____ about his joy as Doctor Li. ----You are right. He devotes all his time and energies to his cause.
Hundreds of _____ of science fiction are published each year in our country.
----Are you sure that he is able to do the work well? ---- _______ he could give his mind to it.