There is a limit________ the amount of pain we can bear.[ ]

Which of the two sweaters would you like—Well, I have no idea. _____of them look nice.

Everything _____ doing is worthy of_____ well. [ ]

Where’s your father— He _______ Hong Kong on business and he ______ in 2 months.

e class time, our teacher has ____ students do half of the exercisesin class and complete____ for homework.