US Apple decided to expand its business in China in response to an increasing demand ______ digital product.
| A．of | B．from | C．to | D．for |
Scientists are convincedthe p
ositive effect of laughterphysical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
Playing basketball isgreat fun; it also provides us with a chance to develop our sense ofteam spirit.
| A．a;不填 | B．不填;a | C．a; the | D．不填；不填 |
It is hard to say what kind of person he is. Sometimes he is very friendly; at other times he ___ be very cold.
| A．can | B．must | C．will | D．shall |
In my opinion, ___ matters is not one’s looks, but one’s inner thoughts.
| A．that | B．it | C．what | D．this |
_____ computers are convenient to us in daily life, it may also cause other problems.
| A．Whether | B．Because | C．As | D．While |