The change was so _____ that we hardly noticed it.
| A．actual | B．frequent | C．gradual | D．grateful |
Lady Gaga has put off her concerts because of the difficulties by the ongoing strikes.
| A．caused | B．causing | C．to be caused | D．having caused |
Focused on your heart asks you to do, you’ll realize your dream one day.
| A．that | B．which | C．what | D．it |
By the end of last week, nearly 80 percent of the work .
| A．have finished | B．had been finished | C．will be finished | D．was finished |
We used to mistake that heavy objects fell faster than light .
| A．the ones | B．those | C．ones | D．these |
Keep yourself open we can experience the great joy that friendship can bring.
| A．as if | B．so that | C．even though | D．ever since |