Okay, let's go through each sentence and choose the correct form of the verb.
21. Fiona **is making** a snowman at the moment.
Explanation: The phrase "at the moment" indicates an action happening right now, so we need the present continuous tense.
22. Helen and Tom **are watching** TV now.
Explanation: Similar to the previous sentence, "now" indicates an ongoing action, so we use the present continuous tense.
23. What time **does** the train leave?
Explanation: This is a question about a scheduled event (train departure), so we use the present simple tense with "does" for a singular subject.
24. We **go** to the cinema every Saturday evening.
Explanation: The phrase "every Saturday evening" indicates a regular habit, so we use the present simple tense.
25. On Sundays, we usually **stay** at home.
Explanation: "Usually" suggests a regular occurrence, so we use the present simple tense.
26. What **is** Tim **doing** today?
Explanation: "Today" specifies action happening at the present time therefore present continuous tense is needed.
27. Does Ian **like** your new flat?
Explanation: In this sentence, asking about a general preference, the simple present tense 'like' is appropriate. Using 'is liking' would imply something temporary or unusual, which doesn't fit the context.
28. Where are the children **going**?
Explanation: The question asking about where the children are at the moment so the present continuous tense should be used.
29. Look at Anne. What **is** she **wearing**?
Explanation: Since you are looking at Anne now, the right tense is the present continuous.
30. What **do** you **think**/are you thinking of my dress?
Explanation: Asking for opinion, so the simple present is more appropriate here.