Put yourself in situations where you're forced to communicate in English, ______ you'll see more progress over time．

In some countries, ____ is called "equality" does not really mean equal rights for all people.

The reason why she couldn’t come to the meeting was_____ she had not been invited.

____ surprised me most was ______ they had finished it so quickly.

Maria has to baby-sit. That’s______ she can't come with us.

--- I rang you at about ten, but there was no reply.
--- Oh, that was probably ____ I was seeing the doctor.

15. _______ all the inventions have in common is _____they have succeeded.
A. What; what      B. That; that       C. What; that       D That; what

This old computer must have been of great use to _______ did the scientific research.

--- Do you know _____ Mr. Black’s address is.
--- He may live at No. 18 or No. 19 of Bridge Street. I'm not sure of _____.

--- Do you know him?
--- Yes, but I can’t remember ________I met him for the first time.
A. where           B. what            C that               D. if