Dear, I hope the engine will ______ until we get to the next garage.
| A．hold down | B．hold out | C．hold back | D．hold up |
It is I ____ singing in the garden.
| A．who are | B．who is | C．that am | D．that is |
It was ____ the old worker came that we ____ the experiment.
| A．until; didn’t begin | B．not until; began |
| C．until; began | D．not until; didn’t begin |
____ be careful when crossing the street!
| A．Must | B．Should | C．Ought to | D．Do |
____ come again.
| A．Do | B．Can | C．May | D．Did |
I ____ see him yesterday.
| A．really | B．do | C．did | D．does |