--- What are you busy with? ---The exhibition ____ in the city next week.
Mike apologized for _______ to inform her of the change in the working plan.
It was Tom as well as two of his classmates that _______ invited to the party.
The Chinese exploration ship will join in the search for______ seemed like parts of the missing plane.
— It is hot today, isn’t it? — Yes. _______ yesterday.
______ I admit that there are quite a few problems, I don't agree that they cannot be solved.