20．-Hello．This is Leo speaking．Is that John？
-Sorry，he isn't in．__________．（ ）
-Sorry，he isn't in．__________．（ ）
| A． | Please hold on | B． | May I take a message？ | ||
| C． | What are you saying to him？ |
19．-China is carrying the two-child policy to avoid population problem．
-________．We hope it can work well． （ ）
-________．We hope it can work well． （ ）
| A． | How good is the plan! | B． | How good plan! | ||
| C． | How good the plan is! |
18．Rose cooks meals at home on Sundays．She never eats ________ her mother comes back and she'd like to enjoy it together．（ ）
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| A． | until | B． | when | C． | after |