My momalways tells me that _________/’nʌθɪŋ/ is difficult.

In the questionnaire, the subjects are questioned whether they____banning cars in the city centre．

You’ll have a difficult time knowing who your real friends are if you ______ rich in the future.

The man was seen _____ into the courtyard.

e the exit, many fans waited for the great popsinger, _______to take a picture with him.