What's the secret of success， Dr． Know？
More time and effort， _________ you'll make it some day．（ ）
A．yetB．orC．andD．but
If you take a vacation this summer，so______I．（ ）
| A． |
will |
B． |
do |
C． |
am |
________have you prepared for the competition？
For two months．（ ）
| A． |
How far |
B． |
How long |
C． |
How soon |
Sally's home is far from Fun Times Park， so she ________walks there．（ ）
| A． |
seldom |
B． |
usually |
C． |
often |
His mother took him to visit the Great Wall on his _______birthday．（ ）
| A． |
nine |
B． |
nineth |
C． |
ninth |
They ________on the sofa when the telephone_______．（ ）
| A． |
sit； rang |
| B． |
were sitting； rang |
| C． |
sat； was ringing |