Although this ______ sound like a simple task, great care is needed．
| A．must | B．may | C．should | D．shall |
The firm is now in the _____ of moving the main equipment to new place.
| A．process | B．action | C．development | D．direction |
Without proper lessons, you could _____ a lot of bad habits when playing the piano.
| A．give up | B．catch up | C．pick up | D．keep up |
It suddenly _____ to me that we could ask our neighbors to help us.
| A．thought | B．happened | C．came | D．occurred |
The father as well as his three children _____ skating on the freezing river every Sunday afternoon in winter.
| A．is going | B．go | C．goes | D．are going |
He kept looking at her, wondering whether he _____ her somewhere.
| A．saw | B．has seen | C．sees | D．had seen |