She can't help ________ the house because she's busy making a cake.
19.—Flight 331 _____.I'd better be on my way.Goodbye. —Bye.Happy landing!
20.We met _____ and have become good friends since then.
19._____ your advice, I’m sure to consider it and give you reply in time.
18.--- Tom has a lot of parties recently. ---Yes, that may ____ why he didn’t do well in the test. A, sum up B. add up to C. account for D. make sense of
17.I’m ____a diet, since I put ____ weight easily.