—Why did he come back?
—It is ______ he forgot to take his umbrella with him.
| A．for | B．as | C．since | D．because |
. Many new workers_______ and in six month they will be sent to build a new railway.
| A．are being trained | B．are training | C．will train | D．will be trained |
. ---Could I borrow your car for a while?
--- _________. I won’t use it today.
| A．Never mind | B．Of course you could |
| C．You are welcome | D．By all means |
. It is only in the last sixty years that any evidence that Loch Ness Monster might exist.
| A．there has been | B．there was | C．it has been | D．it had |
.________all his courage, he invites Celine to get off the train with him．
| A．To gather | B．Gathered | C．Gathering | D．Being gathered |
. _______of the household rubbish_______recycled or reused since the new technology was applied.
| A．Three-fourth; has | B．Three-fourth; have been |
| C．Three-fourths; has been | D．Three-fourths; have |