Okay, let's go through each sentence and identify the correct form of the verb.
1. e.g. I watch/'m watching a film tonight. Answer: 'm watching
2. Look at Kate. I don't like the dress she wears/she's wearing. Answer: she's wearing
Explanation: Since we are describing what Kate is wearing *right now*, we use the present continuous tense.
3. Mike makes/is making a snowman at the moment. Answer: is making
Explanation: Similar to the previous sentence, "at the moment" indicates an action in progress, so we use the present continuous tense.
4. What do you think/are you thinking of my dress? Answer: do you think
Explanation: We use "do you think" to ask for someone's opinion in general.
5. What time does/do the train leave? Answer: does
6. We go/are going to the cinema every Saturday evening. Answer: go
Explanation: "Every Saturday evening" indicates a regular habit, so we use the present simple tense.
7. Does Ian like/Is Ian liking your new flat? Answer: Does Ian like
Explanation: "Like" is usually used with the simple present tense.
8. Laura and Tim are watching/watch a play now. Answer: are watching
Explanation: The word "now" indicates a current action, so we use the present continuous tense.
9. On Sundays, we usually stay/are staying at home. Answer: stay
Explanation: "On Sundays" indicates a regular habit, so we use the present simple tense.
10. What does Tim do/is Tim doing today? Answer: is Tim doing
Explanation: "Today" indicates that we are talking about a single day, so we use the present continuous tense.
11. Where are the children go/going? Answer: going
Explanation: The sentence is asking about what the children are doing in this moment, so we use the present continuous tense.