The manager is said to have arrived back from Paris where he ________ some European business partners. [ ]

This, I think, ___ the first time that we ___ traveling togetherWould you like to join us?

1Betty is infront of me,so I am ________Betty.

In the past few decades, scientists have made a great ________ in the treatment of cancer.

You look upset. Anything wrong －I failedin the physics exam again ________ all the efforts I made. Which of the following answers is NOT true