The flu is believed __________ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused |
| B．to have caused |
| C．being caused |
| D．causing |
— Can I lie about seeing a text because I was too busy or lazy to respond to it?
— Receiving a text does not necessarily mean you have to respond. Why waste a perfectly good lie ________ the truth will serve?
| A．unless | B．until |
| C．when | D．while |
People tend to love agricultural products ________ without the use of fertilizers, pesticides or chemical additives.
| A．growing | B．grown |
| C．being grown | D．having been grown |
Taught in a more professional way, you _________ the swimming skill much better.
| A．might master | B．would have mastered |
| C．can have mastered | D．could master |
It really matters _______ he treated the latest failure, for the examination is around the corner.
| A．if | B．that |
| C．why | D．how |
Each party _______ respect the articles of this contract, or a double-sized financial punishment is a must.
| A．will | B．could |
| C．shall | D．should |