29. Can you say _____ certain when he will come here?
| A．at | B．for | C．with | D．In |
I tried my best to treat my son kindly , but he was so naughty that my patience ______at last.
A used up B got away C went down D gave out
Some parents are so protective that want to _____their kids from every kind of danger , real or imagined.
A spot B dismiss C shelter D distinguish
Much to my surprise , such a little boy could _____the puzzle.
A speak B settle C read D answer
How do you suppose it is _____he arrived here ?
A when B before C after D since
Once your business becomes international ,______constantly will be part of your life.
A you fly B your flight C flight D flying