18．We should care more about our health _______ good health is the first step towards success．（ ）
| A． | so | B． | because | C． | but | D． | if |
17．_____I was in the US，I made a lot of American friends．（ ）
| A． | while | B． | Although | C． | Unless | D． | Until |
16．---What about going to the South Lake for a picnic next weekend？
---OK．But I'm not sure _______ it will rain．（ ）
---OK．But I'm not sure _______ it will rain．（ ）
| A． | why | B． | where | C． | when | D． | whether |
15．Tom didn't go to school yesterday he was ill．（ ）
| A． | as | B． | so | C． | because | D． | while |
14． he has little knowledge，the old worker has a lot of experience．（ ）
| A． | Although | B． | Because | C． | If |
13．-Jim，you look so tired!
-Oh，I didn't go to bed ______ it was 12o'clock last night．（ ）
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-Oh，I didn't go to bed ______ it was 12o'clock last night．（ ）
| A． | until | B． | as | C． | if |
strong，than．Tom is stronger than Mike．/Mike is not stronger than Tom．．
make，yesterday．She made a （birthday） cake yesterday．/Did she make a （birthday） cake yesterday？．