50. You won’t be able to see him because he ______ a meeting in Suzhou when you arrive.
| A．will have had | B．will be having | C．will have | D．is having |
--- What are you busy with?
---The exhibition ____ in the city next week．
| A．held | B．will be held | C．to be held | D．being held |
---Jack can't concentrate on his study recently．
--- Yes, that might ____ why he did so badly in the last test．
| A．answer for | B．apply for | C．call for | D．account for |
I can hardly remember any occasions ____ I get caught in a traffic jam in our town．
| A．which | B．that | C．where | D．when |
Holiday shopping ___be a tiring experience．There are so many places to visit and choices to make．
| A．can | B．may | C．shall | D．will |
If a book is in French, ____ will be a challenge for me．
| A．which | B．it | C．what | D．as |