Here's the completed code:
```
# Import the necessary modules
from nltk.tokenize import regexp_tokenize
from nltk.tokenize import TweetTokenizer
# Use the TweetTokenizer to tokenize all tweets into one list
tknzr = TweetTokenizer()
all_tokens = [tknzr.tokenize(t) for t in tweets]
print(all_tokens)
```
The code creates an instance of `TweetTokenizer` called `tknzr`. It then uses a list comprehension to tokenize each tweet in the `tweets` list