.Manufacturers should have professional productivity and technical knowledge to ______ the quality of the products.
| A．predict | B．promise | C．guarantee | D．determine |
．______Hard you may try, you can’t possibly persuade Tom to give up smoking, for he is so addicted to it.
| A．Whatever | B．However | C．Whichever | D．Whenever |
Every year, Tom remembers to have some flowers______to her mother on her birthday.
| A．send | B．sent | C．sending | D．being sent |
It’s not easy to learn English well. ______as much as possible is necessary.
| A．Having read | B．Read | C．Reading | D．To have read |
-----Peter, would you like a beer to go with your meal?
-----Gure, it ______.
| A．ordered | B．was oredred | C．has been ordered | D．has ordered |
Oct.1st, ______is our National Day, is always celebrated with singing and dancig.
| A．as | B．that | C．when | D．which |