Bài 1: Fill in the blank with the right form
11.    If I ______(go) out tonight, I will go with my friends.
12.    If you ______(stay) up late, you would have been exhausted.
13.    If I hadn’t seen him yesterday, I ______(phone) him.
14.    If Mary came, they ______(be) happy.
15.    If we ______(continue) staying here, we would be late.
16.    If we went on holiday this summer, we ______(visit) Tokyo.
17.    If it rains too much, he ______(stay) at home.
18.    If the baby had eaten all the candies, he ______(feel) sick.
19.    If my family ___(not want) to go out, I would cook for dinner.
20.    The coffee ______(taste) bad unless you added the milk.
21.    We ______(not win) the match unless he played  with us.
22.    If the weather were nice, we ______(have) a picnic.
23.    She would have been surprised if her ex-boyfriend __(get) married.
24.    I would have come  early if I ______(not have) anything to do.
25.    He could buy a new car if he ____(have) enough money.
26.    If you __(not come) with me, I will not go to her birthday party.
27.    If Lisa forgot doing homework, the teacher (give) her 
a low mark.
28.    If we recycle more, we ______(help) our planet.
29.    Unless it were so expensive, I ______(buy) it.
30.    Unless they had worn coats, they ______(feel) cold.