_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day．
| A．Having opened | B．Opened |
| C．Opening | D．To open |
The young man is intelligent and diligent; be is sure to____in his new position.
| A．go on | B．go out | C．go for | D．go far |
Watch out! ____caught smoking here shall be fined.
| A．Whoever | B．Whomever | C．Anyone | D．No matter who |
Nowadays food safety is a big problem and nobody can guarantee all foods are safe to us, but food produced in the normal companies is____better.
| A．strictly | B．absolutely | C．relatively | D．exactly |
The teacher said we____ten lessons by the end of this term.
| A．should have studied | B．were going to study |
| C．have studied | D．should study |
AIDS is said____the number one killer of both men and women over the past few years in that poor area, where no medical services are available.
| A．to be | B．to have been | C．being | D．having been |