Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
| A．while | B．or | C．for | D．so |
Mr. Brown’s condition looks very serious and it is doubtful if he will ________.
| A．pull back | B．pull up |
| C．pull through | D．pull out |
When talking about doing exercise, you should choose an activity that you enjoy and _____ that you will stick with.
| A．the one | B．one |
| C．不填 | D．another |
--- Excuse me, but may I have access to the Wi‑Fi here? I’d like to take some photos of the delicious food and update my microblog.
---- . Here is the key to it.
| A．By all means. | B．You said it. |
| C．Allow me, sir. | D．Out of the question. |
Don’t be so discouraged. If you _______ such feelings, you will do better next time.
| A．carry on | B．get back |
| C．break down | D．put away |
Now that you have been _______ to our club, you will enjoy all the benefits and privileges of club membership, which includes free access to the digital version of all the articles.
| A．submitted | B．admitted |
| C．confirmed | D．attended |