—Is it that Jack often plays computer games    makes his parents worry about him ?—Yes , I think so .               

It is not how much we do but how much love we put into what we do                   benefits our work most.

Is it the country _____ you studied English _____ you are going to visit next week?

Was it not until you began to write ______ you should have remembered more words?

It was because of bad weather __________ the football match had to be put off.