Only when I read this story for a second time _________to appreciate its beauty.
| A．did I begin | B．that I begin | C．I began | D．had I begin |
Martin Cooper , a US researcher , was considered _______ the first cell phone .
| A．invented | B．to invent | C．having invented | D．to have invented |
He looked around and caught a man _____ his hand into the pocket of a passenger.
| A．put | B．to be putting | C．to put | D．putting |
They walked together as far as the second crossing ____ they parted .
| A．when | B．which | C．why | D．where |
You may use my bike _____ that you return it by noon.
| A．on condition | B．in condition | C．under condition | D． at conditions |
With all the problems ______, the manager left for home, _______.
| A．solved, satisfied | B．to be solved, with satisfaction |
| C．being solved, satisfied | D．having been solved, with satisfaction |