After describing the planned improvements, she went on _______ how much they would cost.
| A．to explain | B．explaining |
| C．to be explaining | D．having explained |
—Will you see me off at the airport at ten tomorrow morning?
—Sorry, I ________ a lecture then.
| A．will be giving | B．will give | C．give | D．have given |
－Did you have a good sleep last night?
－Yes, never sleep ____．
| A．badly | B．better | C．worse | D．best |
It is the third time so far that such a festival________in my hometown.
| A．is held | B．has been held | C．will be held | D．had been held |
—May I go and play with Dick this afternoon，Mum?
—No，you can’t go out________your work is being done.
| A．before | B．until | C．as | D．the moment |
-The girls in blue are our new classmates. -I know _____.
| A．these | B．so | C．such | D．that |