Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
| A．being used | B．used | C．to be used | D．having been used |
Don’t start reading a book _____ you find that it’s one you can read with ease and understanding.
| A．when | B．if | C．unless | D．Though |
Someone _____ his car in front of my house and it’s blocking my way.
| A．has parked | B．parked | C．was parking | D．had parked |
In the Rose Park, lakes will be built and roses _____ in place, making it the most beautiful in the city.
| A．put | B．putting | C．to put | D．being put |
You _____ an A on your composition, but there were some spelling mistakes.
| A．should receive | B．could have received |
| C．would receive | D．must have received |
To improve the quality of our products, we asked for suggestions _____ had used the products.
| A．whoever | B．who | C．whichever | D．Which |