To improve the quality of our products, we asked for suggestions _____ had used the products.
| A．whoever | B．who | C．whichever | D．Which |
Don’t turn the room __________, as I have just tidied it.
| A．upside down | B．inside | C．outside | D．inside down |
Students are encouraged to _________ the design competition for robots at the university.
| A．take part | B．operate | C．join to | D．participate in |
Having fish at meals regularly can be of great _________ to your heart.
| A．benefit | B．help | C．contribution | D．use |
I don’t think highly of this kind of flower — _________, I don’t care for it.
| A．in other words | B．all in all | C．after all | D．in the meantime |
Little Tom easily ________ himself to the American life as he moved to the USA with his parents when he was only three.
| A．suited | B．adapted | C．matched | D．fit |