Mark needs to learn Chinese _______his company is opening a branch in Beijing.
—I’m worried about tomorrow’s math exam. —______ . I’m sure you will make it.
—Why didn’t you go to the party last night? — I __________.
I discovered that listening to ______is the secret ______language learning.
The students don’t know the broken computer.
I don’t know if Mr. Smith ____. If he ___, I will tell you.