Had they known what was coming next, they second thoughts.
| A．may have | B．could have |
| C．must have had | D．might have had |
With time going by, we have come to realize that creativity is _______it takes to keep a nation highly competitive.
| A．what | B．how | C．why | D．that |
The rich only_________ themselves in making money and had no eye for the needs and welfare of their workers．
| A．occupied | B．concerned | C．enjoyed | D．devoted |
Near the table ______ a hungry dog, which desired to satisfy his hunger with ______ fell from the table.
| A．lay; what | B．lay; that | C．laid; that | D．laid; something |
— How’s your new babysitter?
—We ______ ask for a better one. All our kids love her so much.
| A．should | B．might | C．mustn’t | D．couldn’t |
Generally speaking, ________according to the directions, the medicine has no side effect.
| A．when taken | B．when taking | C．when to take | D．when to be taken |