28. --- Is Bob still performing?
--- I’m afraid not. He is said _____ the stage already as he has become an official.
| A．to have left | B．to leave | C．to have been left | D．to be left |
By the time you have finished this book, your meal ______ cold.
| A．gets | B．has got | C．will get | D．is getting |
—It’s a long time________I saw you last.
—Yes，and what a pity it is now that it will be a long time________we see each other again.
| A．before；since | B．since；when | C．since；before | D．when；before |
The factory produces two million pairs of shoes every year, half _______ are sold abroad.
| A．of which | B．which of | C．of them | D．of that |
We should develop the sunshine project actively, because it can save _______ resources as well as reduce pollution.
| A．power | B．strength | C．force | D．energy |
—The box looks so heavy. Shall I give you a hand?
— Thank you. _______.
| A．It’s up to you | B．It couldn’t be better |
| C．It all depends | D．If you prefer |