–What’s that noise? --Oh, I forgot to tell you. The new machine __________.
_______two exams to worry about,l have to work really hard this weekend.
We had a tiring meeting _______ I kept falling asleep.
The popular star stood there,_______by many students.
You'll feel much better if you_______ the pills.
Tell your friend not to take the pills _______ he may have health problems in the future, _______ it is too late.