He found the boy __________ to a tree in front of the house.
| A．tying | B．tie | C．tied | D．to tie |
The loss has not yet been ______ accurately, but it is believed to be well beyond a hundred million dollars.
| A．calculated | B．considered | C．completed | D．controlled |
—Why does the lake smell terrible?
—Because large quantities of water in the lake .
| A．have polluted | B．is being polluted | C．has been polluted | D．have been polluted |
John plays basketball well, _______his favorite sport is badminton.
| A．so | B．or | C．yet | D．for |
The day________ he was looking forward________ in the end.
| A．when; to come | B．which; to come |
| C．when; to came | D．which; to came |
—Who ________ it be that is knocking at the door?
—It________ be Mother, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |