She looks sad. Could you please tell me ____ that prevents her from being as happy as before?
| A．what it is | B．it is what | C．how it is | D．it is how |
He asked us to __________him __________carrying through their plan.
| A．assist; with | B．help; to | C．assist; in | D．help; with |
According to the local newspaper, _____ electric shock happening in the kindergarten came as _____ big shock to the public.
| A．不填；the | B．the；a | C．不填；a | D．the；the |
—How can I get more information about your products?
—_____ to call the sales office or visit our website.
| A．Go ahead | B．You are wanted | C．You need | D．You are welcome |
---May I borrow your book Steve Jobs ?
--- ________ you return it before Friday.
| A．If only | B．Unless | C．On condition that | D．Now that |
---Shall I give you a ride since you live so far away?
---Thank you. ____.
| A．It couldn’t be better | B．Of course you can |
| C．If you like | D．If you are convenient |