Many firms give away small quantities of theirproductions as _______ so that people can try them before buying.

I’m sorry I didn’t phone you，but I’ve been very busy_____ the pastcouple of weeks．

How many girls are there in your class —______ them _____ over twenty.

s a means of communication, is quite popular among us and costs less than the traditional forms.—______________.

You can depend on whatever promise _______ he makes.