Finding the __________ look on the students' faces, the professor felt __________ about his explanation.
—Shall we have our picnic tomorrow?—________ it doesn’t rain.
It is not immediately clear ________ the financial crisis will soon be over.
But now they seem to take ________ for granted that they can show up any time they like.
I ________ be invited to her birthday party held in the most famous restaurant in the city.
—Here is a photo of my family taken 10 years ago. Can you ________ my brother?—The boy in yellow,I guess.