Some experts think reading is the fundamental skill upon______school education depends.
| A．it | B．that | C．whose | D．which |
_____ a reply, he decided to write again.
| A．Not receiving | B．Receiving not |
| C．Not having receiving | D．Having not receiving |
Gone forever ____ when we used foreign oil.
| A．the days are | B．the days were |
| C．are the days | D．were the days |
-----When will they come back?
-----I _____ don’t know.
| A．simply | B．hopefully | C．happen | D．as well |
She was more headstrong than ______.
| A．the rest of us | B．us the rest |
| C．the other of us | D．us the other |
Though ______, many laws of nature exist.
| A．not having been discovered | B．having not been discovered |
| C．not having discovered | D．having not discovered |