4．You′ll do much better in your exam ______ you′re more careful with your spelling．（ ）
| A． | if | B． | although | C． | cinema | D． | library |
3．-Excuse me．I wonder _____ there is a bus here to go to Downing Street．
---Yes，Bus No.223（ ）
---Yes，Bus No.223（ ）
| A． | that | B． | when | C． | why | D． | whether |
2．--The secret is between you and me．
---I promise．I won't tell others ______you say I can．（ ）
---I promise．I won't tell others ______you say I can．（ ）
| A． | unless | B． | or | C． | since | D． | and |
1．My grandfather doesn't have any hobbies-__________ you call playing cards a hobby．（ ）
| A． | if | B． | when | C． | since | D． | unless |
20．Pandas are facing danger！The situation won't change humans stop killing．（ ）
| A． | unless | B． | though | C． | if | D． | after |
19．You'd better travel around Nanjing with a local tour guide ______ you want to know more about its culture．（ ）
| A． | unless | B． | until | C． | although | D． | if |
18．I was writing a diary ______ my brother was watching TV yesterday evening．（ ）
| A． | before | B． | after | C． | until | D． | while |
17．We will go camping in the mountains ______ it rains tomorrow．（ ）
| A． | unless | B． | but | C． | or | D． | so |
16．_______he had failed many times，he didn't give up and succeeded in the end．（ ）
| A． | Unless | B． | Although | C． | If |
15．I don't like TV series ________ it's boring．（ ）
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| A． | but | B． | and | C． | because |