There is no doubt _____ he will finish the task in time.
| A．while | B．why | C．if | D．that |
There were some seats left over _____every delegate had sat down.
| A．when | B．until | C．that | D．where |
We forget to bring our tickets , but please let us enter, _____？
| A．do you | B．can we | C．will you | D．shall we |
Mr. White will come to the party on Sunday, _______ he promised to every one of us.
| A．when | B．that | C．what | D．which |
_______ that caused him to serve dinner an hour later than usual.
| A．It was we being late | B．It was our being late |
| C．It was we were too late | D．It was because we were late |
China _______ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |