61. In some restaurants, food and service are worse than ______ used to be.
| A．they | B．it | C．them | D．that |
Whocanthinkofasituation__________thisidiomcanbeused?
| A．which | B．that | C．where | D．inthat |
You may choose one from _________ was left.
| A．that | B．all | C．those which | D．what |
It isn't decided yet _______ we will attend the meeting.
| A．if | B．why | C．that | D．whether |
It takes time to build ______ when you are learning a difficult skill.
| A．confidence | B．strength | C．energy | D．belief |
Four-fifths of the crop ______.
| A．are ruined | B．was ruined | C．were ruined | D．have been ruined |